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fix: Narrow down from string | undefined to string #65248

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fix: Narrow down from string | undefined to string #65248

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40f3075
fix: Narrow down from `string | undefined` to `string`
icyJoseph May 1, 2024
744b530
test: Empty env vars are the same, before and after hydration
icyJoseph May 1, 2024
a8b4075
Merge branch 'canary' into fix/empty_NEXT_PUBLIC_env_vars
icyJoseph May 2, 2024
a088591
Merge branch 'canary' into fix/empty_NEXT_PUBLIC_env_vars
icyJoseph May 6, 2024
03ac007
Merge branch 'canary' into fix/empty_NEXT_PUBLIC_env_vars
icyJoseph May 11, 2024
233e7ac
Merge branch 'canary' into fix/empty_NEXT_PUBLIC_env_vars
icyJoseph May 17, 2024
f29770e
Merge branch 'canary' into fix/empty_NEXT_PUBLIC_env_vars
icyJoseph May 28, 2024
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4 changes: 2 additions & 2 deletions packages/next/src/build/webpack/plugins/define-env-plugin.ts
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Original file line number Diff line number Diff line change
Expand Up @@ -62,7 +62,7 @@ function getNextPublicEnvironmentVariables(): DefineEnv {
for (const key in process.env) {
if (key.startsWith('NEXT_PUBLIC_')) {
const value = process.env[key]
if (value) {
if (value != null) {
defineEnv[`process.env.${key}`] = value
}
}
Expand All @@ -79,7 +79,7 @@ function getNextConfigEnv(config: NextConfigComplete): DefineEnv {
const env = config.env
for (const key in env) {
const value = env[key]
if (value) {
if (value != null) {
errorIfEnvConflicted(config, key)
defineEnv[`process.env.${key}`] = value
}
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3 changes: 2 additions & 1 deletion test/integration/env-config/app/.env
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Original file line number Diff line number Diff line change
Expand Up @@ -15,4 +15,5 @@ ENV_FILE_EXPANDED_ESCAPED=\$ENV_FILE_KEY
ENV_FILE_KEY_EXCLAMATION="hello!"
ENV_FILE_PROCESS_ENV="env-file"
ENV_KEY_IN_NEXT_CONFIG="hello from next.config.js"
NEXT_PUBLIC_ENV_KEY_IN_NEXT_CONFIG="hello again from next.config.js"
NEXT_PUBLIC_ENV_KEY_IN_NEXT_CONFIG="hello again from next.config.js"
NEXT_PUBLIC_EMPTY_ENV_VAR=
6 changes: 5 additions & 1 deletion test/integration/env-config/app/pages/index.js
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Expand Up @@ -25,13 +25,14 @@ const variables = [
'NEW_ENV_LOCAL_KEY',
'NEW_ENV_DEV_KEY',
'NEXT_PUBLIC_HELLO_WORLD',
'NEXT_PUBLIC_EMPTY_ENV_VAR',
]

export async function getStaticProps() {
const items = {}

variables.forEach((variable) => {
if (process.env[variable]) {
if (typeof process.env[variable] !== 'undefined') {
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the other test pages on this integration suite, do the very same check

items[variable] = process.env[variable]
}
})
Expand All @@ -53,6 +54,9 @@ export default function Page({ env }) {
<div id="nextConfigNewPublicEnv">
{process.env.NEXT_PUBLIC_NEW_NEXT_CONFIG_VALUE}
</div>
<div id="nextPublicEmptyEnvVar">
{`${process.env.NEXT_PUBLIC_EMPTY_ENV_VAR}`}
</div>
</>
)
}
7 changes: 7 additions & 0 deletions test/integration/env-config/test/index.test.js
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Expand Up @@ -128,6 +128,13 @@ const runTests = (mode = 'dev', didReload = false) => {
expect(data.ENV_FILE_PRODUCTION_LOCAL_OVERRIDEOVERRIDE_TEST).toEqual(
isDev ? 'env' : 'localproduction'
)
expect(data.NEXT_PUBLIC_EMPTY_ENV_VAR).toEqual('')

const browser = await webdriver(appPort, '/')
// Verify that after hydration, the empty env var is not replaced by undefined
expect(
await browser.waitForElementByCss('#nextPublicEmptyEnvVar').text()
).toBe('')
})
}

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