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transform-cjs-dew.js
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const { parse } = require('@babel/parser');
const { basename, extname } = require('path');
const stage3Syntax = ['asyncGenerators', 'classProperties', 'optionalCatchBinding', 'objectRestSpread', 'numericSeparator', 'dynamicImport', 'importMeta'];
// possibly have this binding configurable to an import in future
// (nodeRequireModule, nodeRequireExport)
// that could support taking import.meta and using import.meta.resolve / import.meta.url
function getNodeRequireBinding (path, state) {
if (!state.nodeRequireBinding)
state.nodeRequireBinding = path.scope.getProgramParent().generateUidIdentifier(state.opts.browserOnly ? 'nullRequire' : 'nodeRequire');
return state.nodeRequireBinding;
}
const strictReservedOrKeyword = Object.assign(
Object.create(null), {
// strict reserved
"implements":1, "interface":1, "let":1, "package":1, "private":1, "protected":1, "public":1, "static":1, "yield":1, "arguments":1, "eval":1, "await":1, "enum":1,
// keyword
"break":1, "case":1, "catch":1, "continue":1, "debugger":1, "default":1, "do":1, "else":1, "finally":1, "for":1, "function":1, "if":1, "return":1, "switch":1,
"throw":1, "try":1, "var":1, "while":1, "with":1, "null":1, "true":1, "false":1, "instanceof":1, "typeof":1, "void":1, "delete":1, "new":1, "in":1, "this":1, "const":1,
"class":1, "extends":1, "export":1, "import":1, "super":1,
});
function hasBinding (path, bindingName) {
return path.scope.hasBinding(bindingName);
}
function isLive(path) {
const seen = new Set();
let curPath = path;
while (curPath) {
if (seen.has(curPath)) return false;
seen.add(curPath);
curPath = curPath.parentPath;
}
return true;
}
const topLevelReserved = Object.assign(
Object.create(null), {
"global":1, "self":1, "globalThis":1
});
const transformIds = Object.assign(
Object.create(null), {
// transform-specific!
"process":1, "Buffer":1, "global":1, "exports":1, "module":1
});
function createProcessGuard (guardFn) {
return {
enter (path, state) {
// hasProcess being set to true is always gated on the process guard, so this is reliable in both enter and exit
// even if it werent, once we have process that's the same as a positive process guard anyway
if (state.hasProcess)
return;
if (!guardFn(path, state))
return;
// this is invariant of visitation
if (hasBinding(path, 'process'))
return;
state.processGuard++;
},
exit (path, state) {
if (state.hasProcess)
return;
if (!guardFn(path, state))
return;
if (hasBinding(path, 'process'))
return;
state.processGuard--;
}
};
}
module.exports = function ({ types: t }) {
const exportsIdentifier = t.identifier('exports');
const moduleIdentifier = t.identifier('module');
const dewIdentifier = t.identifier('dew');
const dewInterop = t.identifier('__dew');
const defaultIdentifier = t.identifier('default');
const globalThis = t.identifier('globalThis');
const globalThisPredicate = t.binaryExpression('!==', t.unaryExpression('typeof', globalThis), t.stringLiteral('undefined'));
const selfIdentifier = t.identifier('self');
const ifSelfPredicate = t.binaryExpression('!==', t.unaryExpression('typeof', selfIdentifier), t.stringLiteral('undefined'));
const requireSub = (dep) => {
if (dep.dew && dep.ns) {
const interopExpression = t.memberExpression(dep.id, dewInterop);
return t.conditionalExpression(interopExpression, t.callExpression(interopExpression, []), t.memberExpression(dep.id, defaultIdentifier));
}
return dep.dew ? t.callExpression(dep.id, []) : dep.id;
};
const nodeRequire = (path, state, depNode) => {
return t.callExpression(getNodeRequireBinding(path, state), [depNode]);
};
const moduleDeclarator = t.variableDeclaration('var', [
t.variableDeclarator(moduleIdentifier, t.objectExpression([
t.objectProperty(exportsIdentifier, exportsIdentifier)
]))
]);
// we detect optional require based on pattern matching:
// try { const? x = require('x') } catch (e) { ... }
function isOptionalRequire (path) {
if (t.isMemberExpression(path.parentPath))
return isOptionalRequire(path.parentPath);
const secondParent = path.parentPath && path.parentPath.parentPath;
const fourthParent = secondParent.parentPath && secondParent.parentPath.parentPath;
return secondParent && fourthParent &&
t.isTryStatement(fourthParent) && fourthParent.node.block.body.length >= 1 &&
(t.isVariableDeclarator(path.parentPath) && t.isVariableDeclaration(secondParent) ||
t.isAssignmentExpression(path.parentPath) && t.isExpressionStatement(secondParent));
}
function getFunctionScope (path) {
let fnPath = path;
while (fnPath.parent && !((t.isFunctionDeclaration(fnPath.parent) || t.isFunctionExpression(fnPath.parent)) && fnPath.parent.body === fnPath.node))
fnPath = fnPath.parentPath;
return fnPath.parent && fnPath;
}
const cjsScopeVars = ['require', 'module', 'exports', '__filename', '__dirname'];
function resolvePartialWildcardString (node, lastIsWildcard, exprs) {
if (t.isStringLiteral(node))
return node.value;
if (t.isTemplateLiteral(node)) {
let str = '';
for (let i = 0; i < node.quasis.length; i++) {
const quasiStr = node.quasis[i].value.cooked;
if (quasiStr.length) {
str += quasiStr;
lastIsWildcard = false;
}
const nextNode = node.expressions[i];
if (nextNode) {
const nextStr = resolvePartialWildcardString(nextNode, lastIsWildcard, exprs);
if (nextStr.length) {
lastIsWildcard = nextStr.endsWith('*');
str += nextStr;
}
}
}
return str;
}
if (t.isBinaryExpression(node) && node.operator === '+') {
const leftResolved = resolvePartialWildcardString(node.left, lastIsWildcard, exprs);
if (leftResolved.length)
lastIsWildcard = leftResolved.endsWith('*');
const rightResolved = resolvePartialWildcardString(node.right, lastIsWildcard, exprs);
return leftResolved + rightResolved;
}
if (t.isIdentifier(node, { name: '__dirname' })) {
return '.';
}
exprs.push(node);
return lastIsWildcard ? '' : '*';
}
function canResolvePartialWildcardString (node) {
return t.isStringLiteral(node) || t.isTemplateLiteral(node) && node.quasis[0].value.cooked.length || t.isBinaryExpression(node) || t.isIdentifier(node) && node.name === '__dirname';
}
// typeof setImmediate [!=]==
function isLogicalOrConditionalBinaryExpression (path) {
return t.isBinaryExpression(path.node) && (
t.isConditionalExpression(path.parentPath.node) && path.parentPath.node.test === path.node ||
t.isLogicalExpression(path.parentPath.node) && path.parentPath.node.left === path.node
);
}
function addDependency (path, state, depModuleArg, optional = false) {
if (path.parentPath && path.parentPath.data === 'dead')
return null;
const exprs = [];
let depModule = resolvePartialWildcardString(depModuleArg, false, exprs);
// no support for fully dynamic require
if (depModule === '*') {
return nodeRequire(path, state, depModuleArg);
}
let depResolved;
if (depModule.indexOf('*') !== -1) {
depResolved = state.opts.resolve(depModule, { wildcard: true, optional });
if (typeof depResolved === 'string' && depResolved.indexOf('*') !== -1)
return null;
if (!depResolved)
return nodeRequire(path, state, depModuleArg);
if (depResolved instanceof Array) {
// add each module as a dependency (still using resolver)
// (we're kind of relying on .node wildcards not being common, could be added though)
const depExprs = depResolved.map(m => generateDependency(m, path, state));
const exprIds = exprs.map((_expr, i) => t.Identifier('e' + (i === 0 ? '' : i + 1)));
// trailing * means we must permit wildcardExtensions variations
const wildcardExtensions = depModule.endsWith('*') && state.opts.wildcardExtensions;
const regEx = new RegExp(depModule.replace(/[.+?^${}()|[\]\\]/g, '\\$&').replace(/\*/g, '(.*)'));
const matchExprs = depResolved.map(resolved => {
const match = resolved.match(regEx);
return exprs.map((_expr, i) => t.binaryExpression('===', exprIds[i], t.stringLiteral(match[i + 1]))).reduce((reduction, next, i) => {
if (i === exprs.length - 1 && wildcardExtensions) {
const str = match[i + 1];
const ext = wildcardExtensions.find(ext => str.endsWith(ext));
if (ext)
next = t.logicalExpression('||', next, t.binaryExpression('===', exprIds[i], t.stringLiteral(str.substr(0, str.length - ext.length))));
}
if (reduction)
return t.logicalExpression('&&', reduction, next);
return next;
}, null);
});
const matchExpression = matchExprs.reverse().reduce((reduction, next, i) => {
return t.conditionalExpression(next, depExprs[matchExprs.length - i - 1], reduction);
}, t.nullLiteral());
return t.callExpression(t.functionExpression(null, exprIds, t.blockStatement([t.returnStatement(matchExpression)])), exprs);
}
}
else {
depResolved = state.opts.resolve(depModule, { optional });
}
if (depResolved === undefined)
depResolved = depModule;
if (depResolved === null || depResolved.endsWith('.node'))
return nodeRequire(path, state, depModuleArg);
return generateDependency(depResolved, path, state);
}
function generateDependency (depResolved, path, state) {
if (typeof depResolved !== 'string')
throw new Error('Expected a string.');
if (depResolved === '@empty')
return t.objectExpression([]);
for (let dep of state.deps) {
if (dep.literal.value === depResolved)
return requireSub(dep, state);
}
let dew = true, ns = false;
const esmDependency = state.opts.esmDependencies && state.opts.esmDependencies(depResolved);
if (esmDependency === 'interop')
dew = true, ns = true;
else if (esmDependency === 'namespace')
ns = true, dew = false;
else if (esmDependency === 'namespace-interop')
ns = true, dew = false;
else if (esmDependency)
dew = false;
const uidName = basename(depResolved);
const uidExt = extname(uidName);
const name = uidName.substr(0, uidName.length - uidExt.length);
const depName = path.scope.getProgramParent().generateUid(name);
const moduleName = esmDependency === 'namespace-interop' ? path.scope.getProgramParent().generateUid(name) : depName;
const dep = {
literal: t.stringLiteral(depResolved),
id: t.identifier(depName + (dew && !ns ? 'Dew' : '')),
mid: t.identifier(moduleName + (dew && !ns ? 'Dew' : '')),
dew,
ns
};
state.deps.push(dep);
return requireSub(dep, state);
}
function dce (path) {
let parentNode = path.parentPath.node;
// inline direct string equalities as "true" or "false"
if (t.isBinaryExpression(parentNode)) {
if (parentNode.operator === '===' || parentNode.operator === '==') {
if (t.isStringLiteral(parentNode.left) && t.isStringLiteral(parentNode.right)) {
path.parentPath.replaceWith(t.booleanLiteral(parentNode.left.value === parentNode.right.value));
dce(path.parentPath);
}
}
if (parentNode.operator === '!==' || parentNode.operator === '!=') {
if (t.isStringLiteral(parentNode.left) && t.isStringLiteral(parentNode.right)) {
path.parentPath.replaceWith(t.booleanLiteral(parentNode.left.value !== parentNode.right.value));
dce(path.parentPath);
}
}
}
// bubble up "true" and "false" through logical expressions where possible
if (t.isLogicalExpression(parentNode)) {
if (parentNode.operator === '&&') {
if (t.isBooleanLiteral(parentNode.left)) {
// true && X -> X
if (parentNode.left.value) {
path.parentPath.replaceWith(parentNode.right);
dce(path.parentPath);
}
// false && X -> false
else {
path.parentPath.replaceWith(t.booleanLiteral(false));
dce(path.parentPath);
}
}
// null && X -> null
else if (t.isNullLiteral(parentNode.left)) {
path.parentPath.replaceWith(t.nullLiteral());
dce(path.parentPath);
}
}
else if (parentNode.operator === '||') {
// false || null || X -> X
if (t.isBooleanLiteral(parentNode.left) && !parentNode.left.value || t.isNullLiteral(parentNode.left)) {
path.parentPath.replaceWith(parentNode.right);
dce(path.parentPath);
}
// true || X -> true
else if (t.isBooleanLiteral(parentNode.left) && parentNode.left.value) {
path.parentPath.replaceWith(t.booleanLiteral(true));
dce(path.parentPath);
}
}
}
// if we have a direct boolean in an IfStatement, remove the falsy branch
else if (t.isIfStatement(parentNode) && path.node === parentNode.test) {
let knownPredicate = false;
let truthy = false;
if (t.isBooleanLiteral(parentNode.test)) {
knownPredicate = true;
truthy = parentNode.test.value;
}
if (t.isIdentifier(parentNode.test, { name: 'undefined' })) {
knownPredicate = true;
truthy = false;
}
if (knownPredicate) {
let consequent = path.parentPath.get('consequent');
let alternate = path.parentPath.get('alternate');
path.skip();
if (truthy) {
if (alternate.node) {
alternate.skip();
alternate.remove();
}
if (t.isBlockStatement(consequent.node)) {
if (consequent.node.body.length === 1 && t.isExpressionStatement(consequent.node.body[0])) {
path.parentPath.replaceWith(consequent.node.body[0]);
}
}
else {
path.parentPath.replaceWith(consequent);
}
}
else {
if (consequent.node) {
consequent.skip();
consequent.remove();
}
if (t.isBlockStatement(alternate.node)) {
if (alternate.node.body.length === 1 && t.isExpressionStatement(alternate.node.body[0])) {
path.parentPath.replaceWith(alternate.node.body[0]);
}
}
else if (alternate.node) {
path.parentPath.replaceWith(alternate);
}
else {
path.parentPath.remove();
}
}
}
}
// if we have a direct boolean in a ConditionalExpression, inline the truthy branch
else if (t.isConditionalExpression(parentNode) && path.node === parentNode.test && t.isBooleanLiteral(parentNode.test)) {
let consequent = path.parentPath.get('consequent');
let alternate = path.parentPath.get('alternate');
path.skip();
if (parentNode.test.value) {
alternate.data = 'dead';
path.parentPath.replaceWith(consequent);
}
else {
consequent.data = 'dead';
path.parentPath.replaceWith(alternate);
}
}
else if (t.isUnaryExpression(parentNode) && parentNode.operator === 'typeof') {
if (t.isIdentifier(path.node, { name: 'undefined' })) {
path.parentPath.replaceWith(t.stringLiteral('undefined'));
dce(path.parentPath);
}
}
}
function getIfTypeOfCheck (node, identifierName, typeString) {
if (!t.isBinaryExpression(node))
return null;
let truthy = false;
if (node.operator === '==' || node.operator === '===') {
truthy = true;
}
else if (node.operator !== '!=' && node.operator !== '!==') {
return null;
}
if (t.isUnaryExpression(node.left, { operator: 'typeof' }) && t.isIdentifier(node.left.argument, { name: identifierName })) {
if (!t.isStringLiteral(node.right))
return null;
if (node.right.value === 'undefined')
truthy = !truthy;
else if (node.right.value !== typeString)
return null;
}
else if (t.isUnaryExpression(node.right, { operator: 'typeof' }) && t.isIdentifier(node.right.argument, { name: identifierName })) {
if (!t.isStringLiteral(node.left))
return null;
if (node.left.value === 'undefined')
truthy = !truthy;
else if (node.left.value !== typeString)
return null;
}
else {
return null;
}
return truthy;
}
let thisOrGlobal;
let filenameReplace;
let dirnameReplace;
let moduleNode;
return {
visitor: {
Program: {
enter (path, state) {
thisOrGlobal = null;
moduleNode = path.node;
state.processGuard = 0;
state.source = path.getSource();
if (path.hub.file.shebang)
path.hub.file.shebang = '';
path.node.directives.forEach((d, index) => {
if (d.value && d.value.value === 'use strict') {
state.isStrict = true;
path.node.directives.splice(index, 1);
}
});
if (state.opts.filename) {
filenameReplace = parse('(' + state.opts.filename + ')', { sourceType: 'module', plugins: stage3Syntax }).program.body[0].expression;
}
if (state.opts.dirname) {
dirnameReplace = parse('(' + state.opts.dirname + ')', { sourceType: 'module', plugins: stage3Syntax }).program.body[0].expression;
}
state.define = {};
state.opts.resolve = state.opts.resolve || (m => m);
if (state.opts.define)
Object.keys(state.opts.define).forEach(defineName => {
let parts = defineName.split('.');
if (parts.length === 1) {
state.define[defineName] = state.opts.define[defineName];
return;
}
let part = parts.shift();
let curDefineObj = state.define[part] = {
defineName: undefined,
defineProperty: undefined
};
while (part = parts.shift()) {
curDefineObj.defineName = part;
if (parts.length)
curDefineObj = curDefineObj.defineProperty = {
defineName: undefined,
defineProperty: undefined
};
}
let defineSource = state.opts.define[defineName];
if (defineSource === defineName)
throw new Error('Defining into own name for ' + defineName + ' not permitted. Use quotes to define strings.');
curDefineObj.defineProperty = state.opts.define[defineName];
});
state.deps = [];
state.functionDepth = 0;
state.classDepth = 0;
state.globalIdentifier = path.scope.generateUidIdentifier('global');
state.usesGlobal = false;
state.usesModule = false;
state.usesExports = false;
state.usesDynamicRequire = false;
state.moduleDotExports = [];
state.inserting = false;
state.nodeRequireBinding = undefined;
state.requireResolve = false;
state.globalRefs = new Set();
if (path.node.body.length !== 1 ||
!t.isExpressionStatement(path.node.body[0]) ||
!t.isCallExpression(path.node.body[0].expression) ||
!t.isFunctionExpression(path.node.body[0].expression.callee) ||
path.node.body[0].expression.arguments.length !== 1)
return;
const arg = path.node.body[0].expression.arguments[0];
if (!t.isConditionalExpression(arg) ||
!t.isLogicalExpression(arg.test, { operator: '&&' }) ||
!t.isBinaryExpression(arg.test.left, { operator: '===' }) ||
!(
(t.isUnaryExpression(arg.test.left.left, { operator: 'typeof' }) &&
t.isIdentifier(arg.test.left.left.argument, { name: 'define' }) &&
t.isStringLiteral(arg.test.left.right, { value: 'function' })) ||
(t.isUnaryExpression(arg.test.left.right, { operator: 'typeof' }) &&
t.isIdentifier(arg.test.left.right.argument, { name: 'define' }) &&
t.isStringLiteral(arg.test.left.left, { value: 'function' }))
) ||
!t.isMemberExpression(arg.test.right, { computed: false }) ||
!t.isIdentifier(arg.test.right.object) ||
!t.isIdentifier(arg.test.right.property, { name: 'amd' }) ||
!t.isFunctionExpression(arg.alternate) ||
arg.alternate.params.length !== 1 ||
!t.isIdentifier(arg.alternate.params[0]) ||
!t.isExpressionStatement(arg.alternate.body.body[0]) ||
!t.isAssignmentExpression(arg.alternate.body.body[0].expression, { operator: '=' }))
return;
const expr = arg.alternate.body.body[0].expression;
if (!t.isMemberExpression(expr.left, { computed: false }) ||
!t.isIdentifier(expr.left.object, { name: 'module' }) ||
!t.isIdentifier(expr.left.property, { name: 'exports' }) ||
!t.isCallExpression(expr.right) ||
!t.isIdentifier(expr.right.callee, { name: arg.alternate.params[0].name }) ||
expr.right.arguments.length !== 1 ||
!t.isIdentifier(expr.right.arguments[0], { name: 'require' }))
return;
let strictBody = t.isExpressionStatement(path.node.body[0].expression.callee.body.body[0]) &&
t.isStringLiteral(path.node.body[0].expression.callee.body.body[0].expression, { value: 'use strict' });
if (path.node.body[0].expression.callee.body.body.length !== strictBody + 1)
return;
const fn = path.node.body[0].expression.callee.body.body[+strictBody];
if (!t.isExpressionStatement(fn) ||
!t.isCallExpression(fn.expression) ||
!t.isIdentifier(fn.expression.callee, { name: arg.test.right.object.name }) ||
fn.expression.arguments.length !== 1 ||
!t.isFunctionExpression(fn.expression.arguments[0]) ||
fn.expression.arguments[0].params.length !== 1 ||
!t.isIdentifier(fn.expression.arguments[0].params[0], { name: 'require' }))
return;
path.get('body.0.expression.callee.body.body.' + +strictBody + '.expression.arguments.0.params.0').remove();
path.get('body.0.expression.arguments.0.alternate.body.body.0.expression.right.arguments.0').remove();
},
exit (path, state) {
state.functionDepth = -1;
state.classDepth = -1;
let exportsReturn = state.usesModule ? t.memberExpression(moduleIdentifier, exportsIdentifier) : exportsIdentifier;
let needsExports = true;
let namedExportsId = state.usesModule ? t.memberExpression(moduleIdentifier, exportsIdentifier) : exportsIdentifier;
/*
* Replace module.exports with exports if module not used
*/
function isRequireAssign (moduleDotExport) {
const parentNode = moduleDotExport.parentPath.node;
return t.isExpressionStatement(moduleDotExport.parentPath.parentPath.node) &&
t.isAssignmentExpression(parentNode, { operator: '=' }) &&
parentNode.left === moduleDotExport.node &&
t.isIdentifier(parentNode.right) &&
state.deps.some(dep => parentNode.right === dep.id)
}
if (!state.usesModule) {
if (!state.usesExports && state.opts.nowrap)
needsExports = state.moduleDotExports.some(moduleDotExport => !isRequireAssign(moduleDotExport) && !t.isUnaryExpression(moduleDotExport.parentPath.node, { operator: 'typeof' }));
if (!needsExports) {
const requireAssign = state.moduleDotExports.find(isRequireAssign);
const onlyExport = state.moduleDotExports.every(moduleDotExport => moduleDotExport === requireAssign || t.isUnaryExpression(moduleDotExport.parentPath.node, { operator: 'typeof' }));
if (requireAssign && onlyExport && requireAssign.parentPath &&
requireAssign.parentPath.parentPath && requireAssign.parentPath.parentPath.node &&
requireAssign.parentPath.parentPath.parentPath &&
requireAssign.parentPath.parentPath.parentPath.node === path.node) {
exportsReturn = null;
}
else if (!requireAssign) {
exportsReturn = t.objectExpression([]);
}
}
for (const moduleDotExport of state.moduleDotExports) {
if (t.isUnaryExpression(moduleDotExport.parentPath.node, { operator: 'typeof' })) {
moduleDotExport.parentPath.replaceWith(t.stringLiteral('object'));
dce(moduleDotExport.parentPath);
}
else if (isRequireAssign(moduleDotExport)) {
if (!exportsReturn) {
// as a sneaky optimization we use a non-capturing default export in the identifier import case
const expression = moduleDotExport.parentPath.node.right;
if (t.isIdentifier(expression) && state.deps.some(dep => expression === dep.id)) {
moduleDotExport.parentPath.parentPath.replaceWith(t.exportNamedDeclaration(null, [t.exportSpecifier(expression, defaultIdentifier)]));
// named exports now link to this id
namedExportsId = expression;
}
else if (!state.opts.namedExports) {
moduleDotExport.parentPath.parentPath.replaceWith(t.exportDefaultDeclaration(expression));
}
else {
// revert to exports for named exports from a module.exports expression
exportsReturn = state.usesModule ? t.memberExpression(moduleIdentifier, exportsIdentifier) : exportsIdentifier;
needsExports = true;
}
}
else {
if (needsExports)
moduleDotExport.parentPath.parentPath.replaceWith(t.assignmentExpression('=', exportsIdentifier, moduleDotExport.parentPath.node.right));
else
moduleDotExport.parentPath.parentPath.replaceWith(t.variableDeclaration('var', [t.variableDeclarator(exportsIdentifier, moduleDotExport.parentPath.node.right)]));
}
}
else {
moduleDotExport.replaceWith(exportsIdentifier);
dce(moduleDotExport);
}
}
}
/*
* Add process and Buffer imports
*/
if (state.hasProcess) {
let dep = addDependency(path, state, t.stringLiteral('process'));
if (dep) {
path.unshiftContainer('body', t.variableDeclaration('var', [
t.variableDeclarator(t.identifier('process'), dep)
]));
}
}
if (state.processId) {
let dep = addDependency(path, state, t.stringLiteral('process'));
if (dep) {
path.unshiftContainer('body', t.variableDeclaration('var', [
t.variableDeclarator(state.processId, dep)
]));
}
}
if (state.hasBuffer) {
let dep = addDependency(path, state, t.stringLiteral('buffer'));
if (dep) {
path.unshiftContainer('body', t.variableDeclaration('var', [
t.variableDeclarator(t.identifier('Buffer'), t.memberExpression(dep, t.identifier('Buffer')))
]));
}
}
/*
* nodeRequire special cases
*/
if (state.nodeRequireBinding) {
if (state.opts.browserOnly) {
const e = t.identifier('e');
const id = t.identifier('id');
if (state.requireResolve) {
path.unshiftContainer('body', t.expressionStatement(t.assignmentExpression('=',
t.memberExpression(state.nodeRequireBinding, t.identifier('resolve')),
state.nodeRequireBinding
)));
}
path.unshiftContainer('body', t.functionDeclaration(state.nodeRequireBinding, [id], t.blockStatement([
t.variableDeclaration('var', [
t.variableDeclarator(e, t.newExpression(t.identifier('Error'), [
t.binaryExpression('+', t.binaryExpression('+', t.stringLiteral("Cannot find module '"), id), t.stringLiteral("'"))
]))
]),
t.expressionStatement(t.assignmentExpression('=', t.memberExpression(e, t.identifier('code')), t.stringLiteral('MODULE_NOT_FOUND'))),
t.throwStatement(e)
])));
}
else {
const module = addDependency(path, state, t.stringLiteral('module'));
const Module = t.identifier('Module');
const m = t.identifier('m');
const e = t.identifier('e');
const id = t.identifier('id');
const filename = t.identifier('filename');
let requireFn = t.callExpression(
t.memberExpression(t.memberExpression(m, t.identifier('require')), t.identifier('bind')),
[m]
);
if (state.requireResolve) {
requireFn = t.callExpression(
t.memberExpression(t.identifier('Object'), t.identifier('assign')),
[
requireFn,
t.objectExpression([
t.objectProperty(t.identifier('resolve'), t.functionExpression(null, [id], t.blockStatement([
t.returnStatement(t.callExpression(t.memberExpression(Module, t.identifier('_resolveFilename')), [id, m]))
])))
])
]
);
}
path.unshiftContainer('body', t.variableDeclaration('var', [
t.variableDeclarator(state.nodeRequireBinding, t.callExpression(t.functionExpression(null, [], t.blockStatement([
t.variableDeclaration('var', [
t.variableDeclarator(Module, t.memberExpression(module, Module))
]),
t.ifStatement(Module, t.blockStatement([
t.variableDeclaration('var', [
t.variableDeclarator(m, t.newExpression(Module, [t.stringLiteral('')]))
]),
t.expressionStatement(t.assignmentExpression('=',
t.memberExpression(m, filename),
t.callExpression(
t.memberExpression(t.memberExpression(
t.metaProperty(t.identifier('import'), t.identifier('meta')),
t.identifier('url')
), t.identifier('substr')),
[t.binaryExpression('+',
t.numericLiteral(7),
t.binaryExpression('>',
t.memberExpression(t.memberExpression(t.callExpression(t.memberExpression(Module, t.identifier('_nodeModulePaths')), [t.stringLiteral('/')]), t.numericLiteral(0), true), t.identifier('length')),
t.numericLiteral(13)
)
)]
)
)),
t.expressionStatement(t.assignmentExpression('=',
t.memberExpression(m, t.identifier('paths')),
t.callExpression(t.memberExpression(Module, t.identifier('_nodeModulePaths')), [
t.callExpression(t.memberExpression(t.memberExpression(m, filename), t.identifier('substr')), [
t.numericLiteral(0),
t.callExpression(t.memberExpression(t.memberExpression(m, filename), t.identifier('lastIndexOf')), [t.stringLiteral('/')])
])
])
)),
t.returnStatement(requireFn)
]), t.blockStatement([t.returnStatement(t.functionExpression(state.nodeRequireBinding, [id], t.blockStatement([
t.variableDeclaration('var', [
t.variableDeclarator(e, t.newExpression(t.identifier('Error'), [
t.binaryExpression('+', t.binaryExpression('+', t.stringLiteral("Cannot find module '"), id), t.stringLiteral("'"))
]))
]),
t.expressionStatement(t.assignmentExpression('=', t.memberExpression(e, t.identifier('code')), t.stringLiteral('MODULE_NOT_FOUND'))),
t.throwStatement(e)
])))]))
])), []))
]));
}
}
/*
* Construct the full body wrapper
*/
// path to ensure bindings are created for exports and __dew__
// tracking at https://github.com/babel/babel/issues/8358
function unshiftBody (path, newNode) {
const [newPath] = path.unshiftContainer('body', newNode);
if (t.isVariableDeclaration(newPath)) {
for (const decl of newPath.get('declarations')) {
path.scope.registerBinding(decl.node.id.name, decl.get('id'));
}
}
}
function pushBody (path, newNode) {
const [newPath] = path.pushContainer('body', newNode);
if (t.isVariableDeclaration(newPath)) {
for (const decl of newPath.get('declarations')) {
path.scope.registerBinding(decl.node.id.name, decl.get('id'));
}
}
}
if (state.opts.nowrap) {
state.inserting = true;
let curChildren;
if (state.topLevelReturn) {
curChildren = [];
for (const childPath of path.get('body')) {
curChildren.push(childPath);
}
}
if (state.usesModule)
unshiftBody(path, moduleDeclarator);
if (needsExports)
unshiftBody(path, t.variableDeclaration('var', [
t.variableDeclarator(exportsIdentifier, t.objectExpression([]))
]));
if (state.usesGlobal)
unshiftBody(path,
t.variableDeclaration('var', [t.variableDeclarator(state.globalIdentifier,
t.conditionalExpression(globalThisPredicate, globalThis, t.conditionalExpression(ifSelfPredicate, selfIdentifier, t.identifier('global')))
)]));
for (let i = state.deps.length - 1; i >= 0; i--) {
const dep = state.deps[i];
if (dep.ns && dep.mid.name !== dep.id.name) {
unshiftBody(path, t.tryStatement(t.blockStatement([
t.ifStatement(
t.binaryExpression('in', t.stringLiteral('default'), dep.mid),
t.expressionStatement(t.assignmentExpression('=', dep.id, t.memberExpression(dep.mid, defaultIdentifier)))
)
]), t.catchClause(t.identifier('e'), t.blockStatement([]))));
unshiftBody(path, t.variableDeclaration('var', [t.variableDeclarator(dep.id, dep.mid)]));
}
unshiftBody(path,
t.importDeclaration([
dep.dew && !dep.ns ? t.importSpecifier(dep.mid, dewIdentifier) : (dep.ns ? t.importNamespaceSpecifier : t.importDefaultSpecifier)(dep.mid)
], dep.literal)
);
}
// top-level return still requires a wrapper
if (state.topLevelReturn) {
pushBody(path,
t.expressionStatement(t.callExpression(t.functionExpression(null, [], t.blockStatement(curChildren.map(path => path.node))), []))
);
for (const path of curChildren)
path.remove();
}
if ((!state.opts.namedExports || !state.opts.namedExports.includes('default')) && exportsReturn)
pushBody(path,
t.exportDefaultDeclaration(exportsReturn)
);
if (state.opts.namedExports && state.opts.namedExports.length) {
const exportDeclarations = [];
const namedExports = [];
const varDeclarations = [];
for (const name of state.opts.namedExports) {
const id = t.identifier(name);
if (name === 'default') {
if (exportsReturn)
pushBody(path, t.exportDefaultDeclaration(exportsReturn));
}
else if (!hasBinding(path, name) && !strictReservedOrKeyword[name] && !transformIds[name] && !state.globalRefs.has(name)) {
exportDeclarations.push(t.variableDeclarator(id, t.memberExpression(namedExportsId, id)));
}
else {
const uid = path.scope.generateUidIdentifier(name);
varDeclarations.push(t.variableDeclarator(uid, t.memberExpression(namedExportsId, id)));
namedExports.push(t.exportSpecifier(uid, id));
}
}
if (exportDeclarations.length)
pushBody(path, t.exportNamedDeclaration(t.variableDeclaration('const', exportDeclarations), []));
if (varDeclarations.length)
pushBody(path, t.variableDeclaration('const', varDeclarations), []);
if (namedExports.length)
pushBody(path, t.exportNamedDeclaration(null, namedExports));
}
return;
}
let dewBodyWrapper = [];
state.deps.forEach(dep => {
dewBodyWrapper.push(
t.importDeclaration([
dep.dew && !dep.ns ? t.importSpecifier(dep.mid, dewIdentifier) : (dep.ns ? t.importNamespaceSpecifier : t.importDefaultSpecifier)(dep.mid)
], dep.literal)
);
if (dep.ns && dep.mid.name !== dep.id.name) {
dewBodyWrapper.push(
t.variableDeclaration('var', [t.variableDeclarator(dep.id, dep.mid)])
);
dewBodyWrapper.push(t.tryStatement(t.blockStatement([
t.ifStatement(
t.binaryExpression('in', t.stringLiteral('default'), dep.mid),
t.expressionStatement(t.assignmentExpression('=', dep.id, t.memberExpression(dep.mid, defaultIdentifier)))
)
]), t.catchClause(t.identifier('e'), t.blockStatement([]))));
}
});
const execIdentifier = path.scope.generateUidIdentifier('dewExec');
dewBodyWrapper.push(t.variableDeclaration('var', [
t.variableDeclarator(exportsIdentifier, t.objectExpression([])),
t.variableDeclarator(execIdentifier, t.booleanLiteral(false))
]));
if (state.usesModule)
dewBodyWrapper.push(moduleDeclarator);
if (state.usesGlobal)
dewBodyWrapper.push(
t.variableDeclaration('var', [t.variableDeclarator(state.globalIdentifier,
t.conditionalExpression(globalThisPredicate, globalThis, t.conditionalExpression(ifSelfPredicate, selfIdentifier, t.identifier('global')))
)]));
dewBodyWrapper.push(
t.exportNamedDeclaration(
t.functionDeclaration(dewIdentifier, [], t.blockStatement([
t.ifStatement(execIdentifier, t.returnStatement(exportsReturn)),
t.expressionStatement(t.assignmentExpression('=', execIdentifier, t.booleanLiteral(true))),
...path.node.body,
t.returnStatement(exportsReturn)
])),
[]
)
);
for (const childPath of path.get('body')) {
childPath.remove();
}
state.inserting = true;
for (let i = 0; i < dewBodyWrapper.length; i++)
pushBody(path, dewBodyWrapper[i]);
}
},
// octal upgrades
NumericLiteral (path) {
if (path.node.extra)
delete path.node.extra;
},
StringLiteral (path) {
if (path.node.extra)
delete path.node.extra;
},
/*
* Support eval('require')
*/
CallExpression (path, state) {
if (!state.opts.browserOnly && t.isIdentifier(path.node.callee, { name: 'eval' }) && !path.scope.getBinding('eval') &&
path.node.arguments.length === 1 && t.isStringLiteral(path.node.arguments[0], { value: 'require' })) {
path.replaceWith(t.identifier('require'));
}
},
/*
* Define plugin
* Detect unsupported require lookups
*/
MemberExpression (path, state) {
if (state.inserting)
return;
if (t.isIdentifier(path.node.object, { name: 'require' }) && !hasBinding(path, 'require')) {
let name = path.node.computed ? path.node.property.value : path.node.property.name;
if (name)
switch (name) {
case 'resolve':
if (t.isCallExpression(path.parent) && path.parent.callee === path.node &&
path.parent.arguments.length === 1) {
state.requireResolve = true;
const expr = path.parent.arguments[0];
const arg = resolvePartialWildcardString(expr, false, []);
// browser resolve wildcards not currently supported
let resolved = arg.indexOf('*') !== -1 ? null : state.opts.resolve(arg, { browserResolve: true });
if (resolved === undefined)
resolved = arg;
const requireBinding = getNodeRequireBinding(path, state);
if (state.opts.browserOnly) {
if (resolved === null) {
// _nodeRequire(expr)
path.parentPath.replaceWith(t.callExpression(requireBinding, [expr]));
}
else {
// './browser-string';
path.parentPath.replaceWith(t.stringLiteral(resolved));
}
}
else {
if (resolved === null) {
// (_nodeRequire.resolve || _nodeRequire)(expr)
path.parentPath.replaceWith(t.callExpression(t.logicalExpression('||',
t.memberExpression(requireBinding, t.identifier('resolve')),
requireBinding
), [expr]));
}
else {
// _nodeRequire.resolve ? _nodeRequire.resolve(expr) : './browser-string';
path.parentPath.replaceWith(t.conditionalExpression(
t.memberExpression(requireBinding, t.identifier('resolve')),
t.callExpression(t.memberExpression(requireBinding, t.identifier('resolve')), [expr]),
t.stringLiteral(resolved)