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// Original: https://github.com/rollup/plugins/tree/8835dd2aed92f408d7dc72d7cc25a9728e16face/packages/json
import JSON5 from 'json5';
import { Plugin } from 'rollup';
import { createFilter, dataToEsm } from '@rollup/pluginutils';
import { RollupJsonOptions } from '@rollup/plugin-json';
export default function json5(options: RollupJsonOptions = {}): Plugin {
const filter = createFilter(options.include, options.exclude);
const indent = 'indent' in options ? options.indent : '\t';
return {
name: 'json5',
// eslint-disable-next-line no-shadow
transform(json, id) {
if (id.slice(-6) !== '.json5' || !filter(id)) return null;
try {
const parsed = JSON5.parse(json);
return {
code: dataToEsm(parsed, {
preferConst: options.preferConst,
compact: options.compact,
namedExports: options.namedExports,
indent,
}),
map: { mappings: '' },
};
} catch (err) {
const message = 'Could not parse JSON file';
const position = parseInt(/[\d]/.exec(err.message)[0], 10);
this.warn({ message, id, position });
return null;
}
},
};
}
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