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3275034bc6
Following up on https://github.com/vercel/next.js/pull/83240 When using ESM syntax in `next.config.ts` on a CJS project, Node.js first assumes it as CJS, then parses it into ESM again, giving a warning: ``` (node:27529) [MODULE_TYPELESS_PACKAGE_JSON] Warning: Module type of file://.../next.config.ts is not specified and it doesn't parse as CommonJS. Reparsing as ES module because module syntax was detected. This incurs a performance overhead. To eliminate this warning, add "type": "module" to .../package.json. ``` Therefore, give users the option to use `next.config.mts` which Node.js expects ESM syntax. The tests are a copy of `next-config-ts-native-ts` and only renamed the config to mts. --------- Co-authored-by: Sebastian "Sebbie" Silbermann <[email protected]>
18 lines
428 B
TypeScript
18 lines
428 B
TypeScript
import type { NextConfig } from 'next'
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// top-level await will only work in Native TS mode.
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// This is to ensure that the test is running in Native TS mode.
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await Promise.resolve()
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const nextConfigAsyncFunction = async (phase, { defaultConfig }) => {
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const nextConfig: NextConfig = {
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...defaultConfig,
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env: {
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foo: phase ? 'foo' : 'bar',
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},
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}
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return nextConfig
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}
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export default nextConfigAsyncFunction
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