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feat(eslint-plugin): [no-base-to-string] add checkUnknown Option#11128

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11 changes: 11 additions & 0 deletionspackages/eslint-plugin/docs/rules/no-base-to-string.mdx
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Original file line numberDiff line numberDiff line change
Expand Up@@ -99,6 +99,17 @@ let text = `${value}`;
String(/regex/);
```

### `checkUnknown`

{/* insert option description */}

The following patterns are considered incorrect with the options `{ checkUnknown: true }`:

```ts option='{ "checkUnknown": true }' showPlaygroundButton
declare const x: unknown;
String(x);
```

## When Not To Use It

If you don't mind a risk of `"[object Object]"` or incorrect type coercions in your values, then you will not need this rule.
Expand Down
16 changes: 14 additions & 2 deletionspackages/eslint-plugin/src/rules/no-base-to-string.ts
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Expand Up@@ -21,6 +21,7 @@ enum Usefulness {
exporttypeOptions=[
{
ignoredTypeNames?:string[];
checkUnknown?:boolean;
},
];
exporttypeMessageIds='baseArrayJoin'|'baseToString';
Expand All@@ -46,6 +47,10 @@ export default createRule<Options, MessageIds>({
type:'object',
additionalProperties:false,
properties:{
checkUnknown:{
type:'boolean',
description:'Whether to also check values of type `unknown`',
},
ignoredTypeNames:{
type:'array',
description:
Expand All@@ -60,6 +65,7 @@ export default createRule<Options, MessageIds>({
},
defaultOptions:[
{
checkUnknown:false,
ignoredTypeNames:['Error','RegExp','URL','URLSearchParams'],
},
],
Expand All@@ -76,6 +82,7 @@ export default createRule<Options, MessageIds>({
type??services.getTypeAtLocation(node),
newSet(),
);

if(certainty===Usefulness.Always){
return;
}
Expand DownExpand Up@@ -213,7 +220,7 @@ export default createRule<Options, MessageIds>({
returncollectToStringCertainty(constraint,visited);
}
// unconstrained generic means `unknown`
returnUsefulness.Always;
returnoption.checkUnknown ?Usefulness.Sometimes :Usefulness.Always;
}

// the Boolean type definition missing toString()
Expand DownExpand Up@@ -251,8 +258,13 @@ export default createRule<Options, MessageIds>({
consttoString=
checker.getPropertyOfType(type,'toString')??
checker.getPropertyOfType(type,'toLocaleString');

if(!toString){
// e.g. any/unknown
// unknown
if(option.checkUnknown&&type.flags===ts.TypeFlags.Unknown){
returnUsefulness.Sometimes;
}
// e.g. any
returnUsefulness.Always;
}

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203 changes: 194 additions & 9 deletionspackages/eslint-plugin/tests/rules/no-base-to-string.test.ts
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Original file line numberDiff line numberDiff line change
Expand Up@@ -475,15 +475,6 @@ declare const bb: ExtendedGuildChannel;
bb.toString();
`,
`
function foo<T>(x: T) {
String(x);
}
`,
`
declare const u: unknown;
String(u);
`,
`
type Value = string | Value[];
declare const v: Value;

Expand DownExpand Up@@ -511,8 +502,202 @@ String(v);
declare const v: ('foo' | 'bar')[][];
String(v);
`,
`
declare const x: unknown;
\`\${x})\`;
`,
`
declare const x: unknown;
x.toString();
`,
`
declare const x: unknown;
x.toLocaleString();
`,
`
declare const x: unknown;
'' + x;
`,
`
declare const x: unknown;
String(x);
`,
`
declare const x: unknown;
'' += x;
`,
`
function foo<T>(x: T) {
String(x);
}
`,
`
declare const x: any;
\`\${x})\`;
`,
`
declare const x: any;
x.toString();
`,
`
declare const x: any;
x.toLocaleString();
`,
`
declare const x: any;
'' + x;
`,
`
declare const x: any;
String(x);
`,
`
declare const x: any;
'' += x;
`,
],
invalid: [
{
code: `
declare const x: unknown;
\`\${x})\`;
`,
errors: [
{
data: {
certainty: 'may',
name: 'x',
},
messageId: 'baseToString',
},
],
options: [
{
checkUnknown: true,
},
],
},
{
code: `
declare const x: unknown;
x.toString();
`,
errors: [
{
data: {
certainty: 'may',
name: 'x',
},
messageId: 'baseToString',
},
],
options: [
{
checkUnknown: true,
},
],
},
{
code: `
declare const x: unknown;
x.toLocaleString();
`,
errors: [
{
data: {
certainty: 'may',
name: 'x',
},
messageId: 'baseToString',
},
],
options: [
{
checkUnknown: true,
},
],
},
{
code: `
declare const x: unknown;
'' + x;
`,
errors: [
{
data: {
certainty: 'may',
name: 'x',
},
messageId: 'baseToString',
},
],
options: [
{
checkUnknown: true,
},
],
},
{
code: `
declare const x: unknown;
String(x);
`,
errors: [
{
data: {
certainty: 'may',
name: 'x',
},
messageId: 'baseToString',
},
],
options: [
{
checkUnknown: true,
},
],
},
{
code: `
declare const x: unknown;
'' += x;
`,
errors: [
{
data: {
certainty: 'may',
name: 'x',
},
messageId: 'baseToString',
},
],
options: [
{
checkUnknown: true,
},
],
},
{
code: `
function foo<T>(x: T) {
String(x);
}
`,
errors: [
{
data: {
certainty: 'may',
name: 'x',
},
messageId: 'baseToString',
},
],
options: [
{
checkUnknown: true,
},
],
},
{
code: '`${{}})`;',
errors: [
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