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custom-babel-loader.js
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custom-babel-loader.js
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"use strict";
const npath = require("path");
// Provides `configPath` option to `@babel/preset-env` so it can find
// a browserslist's config file based on source file's location.
module.exports = require("babel-loader").custom(babel => {
return {
config(cfg) {
let options = cfg.options;
const presets = options.presets;
for (let idx = 0; presets && idx < presets.length; idx++) {
const item = presets[idx];
if (item.name === "@babel/preset-env") {
options = Object.assign({}, options, {
presets: [].concat(
presets.slice(0, idx),
babel.createConfigItem(
[
require.resolve("@babel/preset-env"),
Object.assign({}, item.options, {
configPath: npath.dirname(options.filename)
}),
item.name
],
{dirname: item.dirname, type: "preset"}
),
presets.slice(idx + 1)
)
});
return options;
}
}
return options;
}
};
});