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2 changes: 1 addition & 1 deletion packages/aws-cdk/lib/util/yargs-helpers.ts
Original file line number Diff line number Diff line change
Expand Up @@ -27,7 +27,7 @@ export function yargsNegativeAlias<T extends { [x in S | L]: boolean | undefined
* @returns true if the current process is running in a CI environment
*/
export function isCI(): boolean {
return process.env.CI !== undefined;
return process.env.CI !== undefined && process.env.CI !== 'false' && process.env.CI !== '0';
}

/**
Expand Down
14 changes: 14 additions & 0 deletions packages/aws-cdk/test/util/yargs-helpers.test.ts
Original file line number Diff line number Diff line change
@@ -0,0 +1,14 @@
import { isCI } from '../../lib/util/yargs-helpers';

test.each([
['true', true],
['1', true],
['false', false],
['0', false],
// The following ones are unexpected but this is the legacy behavior we're preserving.
['banana', true],
['', false],
])('test parsing of falsey CI values: %p parses as %p', (envvar, ci) => {
process.env.CI = envvar;
expect(isCI()).toEqual(ci);
});
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