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feat(eslint-plugin): [prefer-nullish-coalescing] change ignoreConditionalTests default to true #8872

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Apr 22, 2024
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feat(eslint-plugin): [prefer-nullish-coalescing] change ignoreConditionalTests default to true #8872

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2 changes: 1 addition & 1 deletion packages/eslint-plugin/docs/rules/prefer-nullish-coalescing.mdx
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Original file line number Diff line number Diff line change
Expand Up @@ -65,7 +65,7 @@ foo ?? 'a string';

### `ignoreConditionalTests`

Setting this option to `true` will cause the rule to ignore any cases that are located within a conditional test. This is set to `false` by default.
Setting this option to `false` will cause the rule to also check cases that are located within a conditional test. This is set to `true` by default.

Generally expressions within conditional tests intentionally use the falsy fallthrough behavior of the logical or operator, meaning that fixing the operator to the nullish coalesce operator could cause bugs.

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2 changes: 1 addition & 1 deletion packages/eslint-plugin/src/rules/prefer-nullish-coalescing.ts
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Expand Up @@ -100,7 +100,7 @@ export default createRule<Options, MessageIds>({
defaultOptions: [
{
allowRuleToRunWithoutStrictNullChecksIKnowWhatIAmDoing: false,
ignoreConditionalTests: false,
ignoreConditionalTests: true,
ignoreTernaryTests: false,
ignoreMixedLogicalExpressions: false,
ignorePrimitives: {
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7 changes: 0 additions & 7 deletions packages/eslint-plugin/tests/rules/prefer-nullish-coalescing.test.ts
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Expand Up @@ -147,35 +147,30 @@ x === null ? x : y;
declare const x: ${type} | ${nullish};
x || 'foo' ? null : null;
`,
options: [{ ignoreConditionalTests: true }],
})),
...nullishTypeValidTest((nullish, type) => ({
code: `
declare const x: ${type} | ${nullish};
if (x || 'foo') {}
`,
options: [{ ignoreConditionalTests: true }],
})),
...nullishTypeValidTest((nullish, type) => ({
code: `
declare const x: ${type} | ${nullish};
do {} while (x || 'foo')
`,
options: [{ ignoreConditionalTests: true }],
})),
...nullishTypeValidTest((nullish, type) => ({
code: `
declare const x: ${type} | ${nullish};
for (;x || 'foo';) {}
`,
options: [{ ignoreConditionalTests: true }],
})),
...nullishTypeValidTest((nullish, type) => ({
code: `
declare const x: ${type} | ${nullish};
while (x || 'foo') {}
`,
options: [{ ignoreConditionalTests: true }],
})),

// ignoreMixedLogicalExpressions
Expand Down Expand Up @@ -706,7 +701,6 @@ declare const x: ${type} | ${nullish};
if (() => x || 'foo') {}
`,
output: null,
options: [{ ignoreConditionalTests: true }],
errors: [
{
messageId: 'preferNullishOverOr',
Expand All @@ -732,7 +726,6 @@ declare const x: ${type} | ${nullish};
if (function werid() { return x || 'foo' }) {}
`,
output: null,
options: [{ ignoreConditionalTests: true }],
errors: [
{
messageId: 'preferNullishOverOr',
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