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fix(eslint-plugin): [no-inferrable] fix optional param to valid code #5342

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merged 2 commits into from Jul 18, 2022
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fix(eslint-plugin): [no-inferrable] fix optional param to valid code #5342

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7236104
fix(eslint-plugin): [no-inferrable] fix optional param to valid code
Josh-Cena Jul 13, 2022
7598abb
Add definite assignment
Josh-Cena Jul 14, 2022
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13 changes: 12 additions & 1 deletion packages/eslint-plugin/src/rules/no-inferrable-types.ts
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Expand Up @@ -46,6 +46,8 @@ export default util.createRule<Options, MessageIds>({
},
],
create(context, [{ ignoreParameters, ignoreProperties }]) {
const sourceCode = context.getSourceCode();

function isFunctionCall(
init: TSESTree.Expression,
callName: string,
Expand Down Expand Up @@ -215,7 +217,16 @@ export default util.createRule<Options, MessageIds>({
data: {
type,
},
fix: fixer => fixer.remove(typeNode),
*fix(fixer) {
if (
(node.type === AST_NODE_TYPES.AssignmentPattern &&
node.left.optional) ||
(node.type === AST_NODE_TYPES.PropertyDefinition && node.definite)
) {
yield fixer.remove(sourceCode.getTokenBefore(typeNode)!);
}
yield fixer.remove(typeNode);
},
});
}

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49 changes: 48 additions & 1 deletion packages/eslint-plugin/tests/rules/no-inferrable-types.test.ts
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Expand Up @@ -156,7 +156,54 @@ class Foo {

invalid: [
...invalidTestCases,

{
// This is invalid TS semantic, but it's trivial to make valid anyway
code: 'const fn = (a?: number = 5) => {};',
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@armano2 armano2 Jul 13, 2022 •
edited

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not sure if we want to handle this in here, but there is one more use case that is broken.

playground

class Test {
  x!: number = 5
  abstract y!: number = 5
}

maybe something like this could be better:

if (
  node.type === AST_NODE_TYPES.AssignmentPattern &&
  node.left.optional
) {
  yield fixer.remove(sourceCode.getTokenBefore(typeNode)!);
} else if (
  (node.type === AST_NODE_TYPES.TSAbstractPropertyDefinition ||
  node.type === AST_NODE_TYPES.PropertyDefinition) &&
  node.definite
) {
  yield fixer.remove(sourceCode.getTokenBefore(typeNode)!);
}

we can make separate ticket for this, if you like

there is also

class Test2 {
  constructor(private a: number = 5) { }
}

witch is currently not reported

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@Josh-Cena Josh-Cena Jul 14, 2022 •
edited

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I'll add definite assignment to this PR, but the private one seems tangential to this. Does this one also seem worth reporting?

class Test2 {
  x?: number = 5;
}

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Also, the abstract y!: number = 5 is too messed up to be autofixed. The initializer needs to be removed as well. It isn't even reported by the rule under the status quo, so I'll just ignore that.

output: 'const fn = (a = 5) => {};',
options: [
{
ignoreParameters: false,
},
],
errors: [
{
messageId: 'noInferrableType',
data: {
type: 'number',
},
line: 1,
column: 13,
},
],
},
{
// This is invalid TS semantic, but it's trivial to make valid anyway
code: `
class A {
a!: number = 1;
}
`,
output: `
class A {
a = 1;
}
`,
options: [
{
ignoreProperties: false,
},
],
errors: [
{
messageId: 'noInferrableType',
data: {
type: 'number',
},
line: 3,
column: 3,
},
],
},
{
code: "const fn = (a: number = 5, b: boolean = true, c: string = 'foo') => {};",
output: "const fn = (a = 5, b = true, c = 'foo') => {};",
Expand Down