43 lines
923 B
TypeScript
43 lines
923 B
TypeScript
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import type { RunResult } from "./types"
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export interface JsonOutputManager {
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redirectToStderr: () => void
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restore: () => void
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emitResult: (result: RunResult) => void
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}
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interface JsonOutputManagerOptions {
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stdout?: NodeJS.WriteStream
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stderr?: NodeJS.WriteStream
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}
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export function createJsonOutputManager(
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options: JsonOutputManagerOptions = {}
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): JsonOutputManager {
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const stdout = options.stdout ?? process.stdout
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const stderr = options.stderr ?? process.stderr
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const originalWrite = stdout.write.bind(stdout)
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function redirectToStderr(): void {
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stdout.write = function (chunk: string): boolean {
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return stderr.write(chunk)
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}
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}
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function restore(): void {
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stdout.write = originalWrite
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}
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function emitResult(result: RunResult): void {
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restore()
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originalWrite(JSON.stringify(result) + "\n")
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}
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return {
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redirectToStderr,
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restore,
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emitResult,
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}
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}
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