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fix: verbatimModuleSyntax: true support in tsconfig.json #48018

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Jun 9, 2023
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18 changes: 12 additions & 6 deletions packages/next/src/lib/typescript/writeConfigurationDefaults.ts
Original file line number Diff line number Diff line change
Expand Up @@ -18,7 +18,8 @@ type DesiredCompilerOptionsShape = {
}

function getDesiredCompilerOptions(
ts: typeof import('typescript')
ts: typeof import('typescript'),
userTsConfig?: { compilerOptions?: CompilerOptions }
): DesiredCompilerOptionsShape {
const o: DesiredCompilerOptionsShape = {
// These are suggested values and will be set when not present in the
Expand Down Expand Up @@ -73,10 +74,14 @@ function getDesiredCompilerOptions(
reason: 'to match webpack resolution',
},
resolveJsonModule: { value: true, reason: 'to match webpack resolution' },
isolatedModules: {
value: true,
reason: 'requirement for SWC / Babel',
},
...(userTsConfig?.compilerOptions?.verbatimModuleSyntax === true
? undefined
: {
isolatedModules: {
value: true,
reason: 'requirement for SWC / Babel',
},
}),
jsx: {
parsedValue: ts.JsxEmit.Preserve,
value: 'preserve',
Expand Down Expand Up @@ -116,7 +121,6 @@ export async function writeConfigurationDefaults(
await fs.writeFile(tsConfigPath, '{}' + os.EOL)
}

const desiredCompilerOptions = getDesiredCompilerOptions(ts)
const { options: tsOptions, raw: rawConfig } =
await getTypeScriptConfiguration(ts, tsConfigPath, true)

Expand All @@ -129,6 +133,8 @@ export async function writeConfigurationDefaults(
isFirstTimeSetup = true
}

const desiredCompilerOptions = getDesiredCompilerOptions(ts, userTsConfig)

const suggestedActions: string[] = []
const requiredActions: string[] = []
for (const optionKey of Object.keys(desiredCompilerOptions)) {
Expand Down
56 changes: 56 additions & 0 deletions test/integration/tsconfig-verifier/test/index.test.js
Original file line number Diff line number Diff line change
Expand Up @@ -470,6 +470,62 @@ describe('tsconfig.json verifier', () => {
`)
})

it('allows you to set verbatimModuleSyntax true without adding isolatedModules', async () => {
expect(await exists(tsConfig)).toBe(false)

await writeFile(
tsConfig,
`{ "compilerOptions": { "verbatimModuleSyntax": true } }`
)
await new Promise((resolve) => setTimeout(resolve, 500))
const { code, stderr, stdout } = await nextBuild(appDir, undefined, {
stderr: true,
stdout: true,
})
expect(stderr + stdout).not.toContain('isolatedModules')
expect(code).toBe(0)

expect(await readFile(tsConfig, 'utf8')).toMatchInlineSnapshot(`
"{
\\"compilerOptions\\": {
\\"verbatimModuleSyntax\\": true,
\\"lib\\": [
\\"dom\\",
\\"dom.iterable\\",
\\"esnext\\"
],
\\"allowJs\\": true,
\\"skipLibCheck\\": true,
\\"strict\\": false,
\\"forceConsistentCasingInFileNames\\": true,
\\"noEmit\\": true,
\\"incremental\\": true,
\\"esModuleInterop\\": true,
\\"module\\": \\"esnext\\",
\\"moduleResolution\\": \\"node\\",
\\"resolveJsonModule\\": true,
\\"jsx\\": \\"preserve\\",
\\"plugins\\": [
{
\\"name\\": \\"next\\"
}
],
\\"strictNullChecks\\": true
},
\\"include\\": [
\\"next-env.d.ts\\",
\\".next/types/**/*.ts\\",
\\"**/*.ts\\",
\\"**/*.tsx\\"
],
\\"exclude\\": [
\\"node_modules\\"
]
}
"
`)
})

it('allows you to extend another configuration file', async () => {
expect(await exists(tsConfig)).toBe(false)
expect(await exists(tsConfigBase)).toBe(false)
Expand Down