Fix types for ExposureComp

src/Tethr.ts

@@ -428,7 +428,7 @@ export abstract class Tethr
 	async getExposureComp() {
 		return (await this.getExposureCompDesc()).value
 	}
-	async getExposureCompDesc(): Promise<ConfigDesc<string>> {
+	async getExposureCompDesc(): Promise<ConfigDesc<ExposureComp>> {
 		return UnsupportedConfigDesc
 	}
 

src/TethrPTPUSB/TethrPTPUSB.ts

@@ -4,6 +4,7 @@ import {
 	Aperture,
 	BatteryLevel,
 	DriveMode,
+	ExposureComp,
 	ExposureMode,
 	ISO,
 	WhiteBalance,
@@ -249,9 +250,9 @@ export class TethrPTPUSB extends Tethr {
 						break
 				}
 
-				if (integer === 0) return `${sign}${fraction}`
-				if (fraction === '') return `${sign}${integer}`
-				return `${sign}${integer} ${fraction}`
+				if (integer === 0) return `${sign}${fraction}` as ExposureComp
+				if (fraction === '') return `${sign}${integer}` as ExposureComp
+				return `${sign}${integer} ${fraction}` as ExposureComp
 			},
 		})
 	}

src/TethrPTPUSB/TethrPanasonic.ts

@@ -4,6 +4,7 @@ import {times} from 'lodash'
 import {
 	Aperture,
 	ConfigName,
+	ExposureComp,
 	ExposureMode,
 	ISO,
 	ManualFocusOption,
@@ -233,7 +234,7 @@ export class TethrPanasonic extends TethrPTPUSB {
 		return this.getDevicePropDescPanasonic({
 			devicePropCode: DevicePropCodePanasonic.Exposure,
 			decode: v => {
-				if (v === 0x0) return '0'
+				if (v === 0x0) return '0' as ExposureComp
 
 				const steps = v & 0xf
 				const digits = Math.floor(steps / 3)
@@ -243,10 +244,10 @@ export class TethrPanasonic extends TethrPTPUSB {
 				const sign = negative ? '-' : '+'
 				const thirdsSymbol = thirds === 1 ? '1/3' : thirds === 2 ? '2/3' : ''
 
-				if (digits === 0) return sign + thirdsSymbol
-				if (thirds === 0) return sign + digits
+				if (digits === 0) return (sign + thirdsSymbol) as ExposureComp
+				if (thirds === 0) return (sign + digits) as ExposureComp
 
-				return sign + digits + ' ' + thirdsSymbol
+				return (sign + digits + ' ' + thirdsSymbol) as ExposureComp
 			},
 			valueSize: 2,
 		})

src/TethrPTPUSB/TethrSigma.ts

@@ -11,6 +11,7 @@ import {
 	CameraStatus,
 	ConfigName,
 	DriveMode,
+	ExposureComp,
 	ExposureMode,
 	FocusMeteringMode,
 	FocusPeaking,
@@ -599,14 +600,14 @@ export class TethrSigma extends TethrPTPUSB {
 		return this.compensationOneThirdTable.get(exposureComp) ?? null
 	}
 
-	async setExposureComp(value: string): Promise<OperationResult> {
+	async setExposureComp(value: ExposureComp): Promise<OperationResult> {
 		const id = this.compensationOneThirdTable.getKey(value)
 		if (id === undefined) return {status: 'invalid parameter'}
 
 		return this.setCamData(OpCodeSigma.SetCamDataGroup1, 5, id)
 	}
 
-	async getExposureCompDesc(): Promise<ConfigDesc<string>> {
+	async getExposureCompDesc(): Promise<ConfigDesc<ExposureComp>> {
 		const {exposureComp: range} = await this.getCamCanSetInfo5()
 		const value = await this.getExposureComp()
 
@@ -1965,7 +1966,7 @@ export class TethrSigma extends TethrPTPUSB {
 		[0b01110000, 102400],
 	])
 
-	private compensationOneThirdTable = new BiMap<number, string>([
+	private compensationOneThirdTable = new BiMap<number, ExposureComp>([
 		[0b00000000, '0'],
 		[0b00000011, '+1/3'],
 		[0b00000101, '+2/3'],