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4 changes: 3 additions & 1 deletion packages/docusaurus-utils/src/constants.ts
Original file line number Diff line number Diff line change
Expand Up @@ -83,7 +83,9 @@ export const DEFAULT_I18N_DIR_NAME = 'i18n';
export const CODE_TRANSLATIONS_FILE_NAME = 'code.json';

/** Dev server opens on this port by default. */
export const DEFAULT_PORT = 3000;
export const DEFAULT_PORT = process.env.PORT
? parseInt(process.env.PORT, 10)
: 3000;

/** Default plugin ID. */
export const DEFAULT_PLUGIN_ID = 'default';
Expand Down