40 lines
1.1 KiB
JavaScript
40 lines
1.1 KiB
JavaScript
// @flow strict-local
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import type {JSONObject} from '@parcel/types';
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import logger from '@parcel/logger';
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import {Transform} from 'stream';
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// Transforms chunks of json strings to parsed objects.
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// Pair with split2 to parse stream of newline-delimited text.
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export default class JSONParseStream extends Transform {
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constructor(options: mixed) {
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super({...options, objectMode: true});
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}
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// $FlowFixMe We are in object mode, so we emit objects, not strings
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_transform(
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chunk: Buffer | string,
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encoding: string,
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callback: (err: ?Error, parsed: ?JSONObject) => mixed,
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) {
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try {
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let parsed;
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try {
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parsed = JSON.parse(chunk.toString());
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} catch (e) {
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// Be permissive and ignoreJSON parse errors in case there was
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// a non-JSON line in the package manager's stdout.
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logger.verbose({
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message: 'Ignored invalid JSON message: ' + chunk.toString(),
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origin: '@parcel/package-manager',
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});
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return;
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}
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callback(null, parsed);
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} catch (err) {
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callback(err);
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}
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}
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}
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