49 lines
1.5 KiB
TypeScript
49 lines
1.5 KiB
TypeScript
// Original: https://github.com/rollup/plugins/tree/8835dd2aed92f408d7dc72d7cc25a9728e16face/packages/json
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import JSON5 from 'json5';
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import { Plugin } from 'rollup';
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import { createFilter, dataToEsm } from '@rollup/pluginutils';
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import { RollupJsonOptions } from '@rollup/plugin-json';
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// json5 extends SyntaxError with additional fields (without subclassing)
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// https://github.com/json5/json5/blob/de344f0619bda1465a6e25c76f1c0c3dda8108d9/lib/parse.js#L1111-L1112
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interface Json5SyntaxError extends SyntaxError {
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lineNumber: number;
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columnNumber: number;
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}
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export default function json5(options: RollupJsonOptions = {}): Plugin {
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const filter = createFilter(options.include, options.exclude);
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const indent = 'indent' in options ? options.indent : '\t';
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return {
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name: 'json5',
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// eslint-disable-next-line no-shadow
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transform(json, id) {
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if (id.slice(-6) !== '.json5' || !filter(id)) return null;
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try {
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const parsed = JSON5.parse(json);
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return {
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code: dataToEsm(parsed, {
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preferConst: options.preferConst,
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compact: options.compact,
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namedExports: options.namedExports,
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indent,
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}),
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map: { mappings: '' },
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};
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} catch (err) {
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if (!(err instanceof SyntaxError)) {
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throw err;
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}
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const message = 'Could not parse JSON5 file';
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const { lineNumber, columnNumber } = err as Json5SyntaxError;
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this.warn({ message, id, loc: { line: lineNumber, column: columnNumber } });
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return null;
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}
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},
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};
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}
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