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feat(core): introduce GraphQL normalizer
closes #234
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,122 @@ | ||
| import { | ||
| GraphQL, | ||
| IntrospectionDirective, | ||
| IntrospectionField, | ||
| IntrospectionInputValue, | ||
| IntrospectionInterfaceType, | ||
| IntrospectionObjectType, | ||
| IntrospectionType, | ||
| IntrospectionNamedTypeRef, | ||
| IntrospectionSchema | ||
| } from '../types'; | ||
|
|
||
| type DeepWriteable<T> = { -readonly [P in keyof T]: DeepWriteable<T[P]> }; | ||
| type DeepPartial<T> = { [P in keyof T]?: DeepPartial<T[P]> }; | ||
| type DpDw<T> = DeepPartial<DeepWriteable<T>>; | ||
|
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| export class GraphQLNormalizer { | ||
| public normalize(input: GraphQL.Document): GraphQL.Document { | ||
| const schema = (input as DpDw<GraphQL.Document>).data?.__schema; | ||
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|
||
| if (!schema || typeof schema !== 'object' || Array.isArray(schema)) { | ||
| return input; | ||
| } | ||
|
|
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| const result = JSON.parse(JSON.stringify(input)) as DpDw<GraphQL.Document>; | ||
|
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| this.normalizeSchema(result.data.__schema); | ||
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| return result as GraphQL.Document; | ||
| } | ||
|
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| private normalizeSchema( | ||
| schema: DeepPartial<DeepWriteable<IntrospectionSchema>> | ||
| ) { | ||
| this.normalizeTypeRef(schema.queryType); | ||
| this.normalizeTypeRef(schema.mutationType); | ||
| this.normalizeTypeRef(schema.subscriptionType); | ||
|
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| this.normalizeDirectives(schema); | ||
| this.normalizeTypes(schema); | ||
| } | ||
|
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| private normalizeTypeRef( | ||
| typeRef: DpDw<IntrospectionNamedTypeRef<IntrospectionObjectType>> | ||
| ) { | ||
| if (!!typeRef && typeof typeRef === 'object' && !Array.isArray(typeRef)) { | ||
| typeRef.kind ??= 'OBJECT'; | ||
| } | ||
| } | ||
|
|
||
| private normalizeTypes(obj: { types?: DpDw<IntrospectionType>[] }): void { | ||
| obj.types ??= []; | ||
| if (Array.isArray(obj.types)) { | ||
| obj.types.forEach((t) => this.normalizeType(t)); | ||
| } | ||
| } | ||
|
|
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| private normalizeType(type: DpDw<IntrospectionType>) { | ||
| if (this.isTypeKind('OBJECT', type)) { | ||
| this.normalizeFields(type); | ||
| this.normalizeInterfaces(type); | ||
| } | ||
|
|
||
| if (this.isTypeKind('INTERFACE', type)) { | ||
| this.normalizeFields(type); | ||
| this.normalizeInterfaces(type); | ||
| this.normalizePossibleTypes(type); | ||
| } | ||
|
|
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| if (this.isTypeKind('UNION', type)) { | ||
| this.normalizePossibleTypes(type); | ||
| } | ||
|
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| if (this.isTypeKind('INPUT_OBJECT', type)) { | ||
| this.normalizeInputFields(type); | ||
| } | ||
| } | ||
|
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||
| private normalizeDirectives(obj: { | ||
| directives?: DpDw<IntrospectionDirective>[]; | ||
| }) { | ||
| obj.directives ??= []; | ||
| if (Array.isArray(obj.directives)) { | ||
| obj.directives.forEach((directive) => this.normalizeArgs(directive)); | ||
| } | ||
| } | ||
| private normalizeFields(obj: { fields?: DpDw<IntrospectionField>[] }) { | ||
| obj.fields ??= []; | ||
| if (Array.isArray(obj.fields)) { | ||
| obj.fields.forEach((field) => this.normalizeArgs(field)); | ||
| } | ||
| } | ||
|
|
||
| private normalizeInterfaces(obj: { | ||
| interfaces?: DpDw<IntrospectionInterfaceType>[]; | ||
| }) { | ||
| obj.interfaces ??= []; | ||
| } | ||
|
|
||
| private normalizePossibleTypes(obj: { | ||
| possibleTypes?: DpDw<IntrospectionObjectType>[]; | ||
| }) { | ||
| obj.possibleTypes ??= []; | ||
| } | ||
|
|
||
| private normalizeInputFields(obj: { | ||
| inputFields?: DpDw<IntrospectionInputValue>[]; | ||
| }) { | ||
| obj.inputFields ??= []; | ||
| } | ||
|
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||
| private normalizeArgs(obj: { args?: DpDw<IntrospectionInputValue>[] }) { | ||
| obj.args ??= []; | ||
| } | ||
|
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||
| private isTypeKind< | ||
| T extends IntrospectionType['kind'], | ||
| U extends IntrospectionType | ||
| >(kind: T, type: DpDw<U>): type is DpDw<Extract<U, { kind: T }>> { | ||
| return typeof type === 'object' && 'kind' in type && type.kind === kind; | ||
| } | ||
| } |
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