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Add autofix for template-no-obscure-array-access
Implements automatic fixing for numeric array access patterns in templates: - MustacheStatement paths: {{this.list.[0].name}} -> {{get this.list "0.name"}} - Params: {{fn this.func @foo.0.bar}} -> {{fn this.func (get @foo "0.bar")}} - Hash values: {{foo bar=this.list.[0]}} -> {{foo bar=(get this.list "0")}} Handles both dot notation (foo.0.bar) and bracket notation (foo.[0]). Does not autofix @each or [] patterns as those are structural.
1 parent 131cd12 commit 89b919a

4 files changed

Lines changed: 90 additions & 16 deletions

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‎README.md‎

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@@ -239,7 +239,7 @@ rules in templates can be disabled with eslint directives with mustache or html
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| [template-no-negated-comparison](docs/rules/template-no-negated-comparison.md) | disallow negated comparisons in templates | | | |
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| [template-no-negated-condition](docs/rules/template-no-negated-condition.md) | disallow negated conditions in if/unless | | | |
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| [template-no-nested-splattributes](docs/rules/template-no-nested-splattributes.md) | disallow nested ...attributes usage | | | |
242-
| [template-no-obscure-array-access](docs/rules/template-no-obscure-array-access.md) | disallow obscure array access patterns like `[email protected]` | | | |
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| [template-no-obscure-array-access](docs/rules/template-no-obscure-array-access.md) | disallow obscure array access patterns like `[email protected]` | | 🔧 | |
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| [template-no-obsolete-elements](docs/rules/template-no-obsolete-elements.md) | disallow obsolete HTML elements | | | |
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| [template-no-outlet-outside-routes](docs/rules/template-no-outlet-outside-routes.md) | disallow {{outlet}} outside of route templates | | | |
245245
| [template-no-page-title-component](docs/rules/template-no-page-title-component.md) | disallow usage of ember-page-title component | | | |

‎docs/rules/template-no-obscure-array-access.md‎

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@@ -1,5 +1,7 @@
11
# ember/template-no-obscure-array-access
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🔧 This rule is automatically fixable by the [`--fix` CLI option](https://eslint.org/docs/latest/user-guide/command-line-interface#--fix).
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<!-- end auto-generated rule header -->
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Disallow obscure array access patterns in templates.

‎lib/rules/template-no-obscure-array-access.js‎

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@@ -1,3 +1,30 @@
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const DIGIT_REGEXP = /^\[?\d+]?$/;
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/**
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* Extract the target path and string key from a path with numeric segments.
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* E.g. "this.list.0.name" → ["this.list", "0.name"]
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* E.g. "this.list.[0]" → ["this.list", "0"]
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* E.g. "@foo.0.bar" → ["@foo", "0.bar"]
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*
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* @param {string} original The original path string
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* @returns {[string, string]} A tuple of [targetPath, stringKey]
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*/
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function getHelperParams(original) {
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const parts = original.split('.');
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const firstDigitIndex = parts.findIndex((part) => DIGIT_REGEXP.test(part));
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if (firstDigitIndex === -1) {
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return null;
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}
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const targetPath = parts.slice(0, firstDigitIndex).join('.');
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// Strip brackets from digit segments: [0] → 0
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const keyParts = parts.slice(firstDigitIndex).map((part) => part.replace(/^\[(\d+)]$/, '$1'));
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const stringKey = keyParts.join('.');
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return [targetPath, stringKey];
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}
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/** @type {import('eslint').Rule.RuleModule} */
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module.exports = {
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meta: {
@@ -8,6 +35,7 @@ module.exports = {
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url: 'https://github.com/ember-cli/eslint-plugin-ember/tree/master/docs/rules/template-no-obscure-array-access.md',
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templateMode: 'both',
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},
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fixable: 'code',
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schema: [],
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messages: {
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noObscureArrayAccess:
@@ -26,7 +54,7 @@ module.exports = {
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GlimmerPathExpression(node) {
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const path = node.original;
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const sourcePath = context.sourceCode.getText(node);
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// Check for @each or [] in paths
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// Check for @each or [] in paths — these are structural and not autofixable
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if (path && (path.includes('.@each.') || path.includes('.[].'))) {
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context.report({
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node,
@@ -37,13 +65,57 @@ module.exports = {
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}
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// Check for numeric path segments (e.g., foo.0.bar) or bracket notation (e.g., foo.[0])
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if (node.tail && node.tail.some((segment) => /^\d+$/.test(segment))) {
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const params = getHelperParams(path);
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context.report({
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node,
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messageId: 'noObscureArrayAccess',
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data: { path: sourcePath },
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fix: params ? buildFix(context, node, params) : undefined,
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});
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}
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},
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};
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},
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};
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/**
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* Build a fix function for a numeric path expression.
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*
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* @param {import('eslint').Rule.RuleContext} context
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* @param {import('estree').Node} node The GlimmerPathExpression node
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* @param {[string, string]} params The [targetPath, stringKey] tuple
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* @returns {(fixer: import('eslint').Rule.RuleFixer) => import('eslint').Rule.Fix}
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*/
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function buildFix(context, node, params) {
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const [target, key] = params;
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const parent = node.parent;
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// Case 1: PathExpression is the path of a MustacheStatement (e.g., {{this.list.0.name}})
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// Replace the entire mustache inner content with: get target "key"
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if (
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parent &&
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parent.type === 'GlimmerMustacheStatement' &&
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parent.path === node &&
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parent.params.length === 0 &&
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(!parent.hash || parent.hash.pairs.length === 0)
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) {
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return (fixer) => {
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// The mustache is {{path}} — replace just the path portion
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// The source text of the MustacheStatement includes {{ and }}
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const mustacheSource = context.sourceCode.getText(parent);
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const isTriple = mustacheSource.startsWith('{{{');
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const openLen = isTriple ? 3 : 2;
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const closeLen = isTriple ? 3 : 2;
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const innerStart = parent.range[0] + openLen;
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const innerEnd = parent.range[1] - closeLen;
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return fixer.replaceTextRange([innerStart, innerEnd], `get ${target} "${key}"`);
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};
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}
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// Case 2: PathExpression is a param or hash value or any other context
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// Wrap with (get target "key")
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return (fixer) => {
119+
return fixer.replaceText(node, `(get ${target} "${key}")`);
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};
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}

‎tests/lib/rules/template-no-obscure-array-access.js‎

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Original file line numberDiff line numberDiff line change
@@ -40,37 +40,37 @@ ruleTester.run('template-no-obscure-array-access', rule, {
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{
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code: '<template><Foo @onClick={{fn this.func @foo.0.bar}} /></template>',
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output: null,
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output: '<template><Foo @onClick={{fn this.func (get @foo "0.bar")}} /></template>',
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errors: [{ messageId: 'noObscureArrayAccess' }],
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},
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{
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code: '<template>{{foo bar=this.list.[0]}}</template>',
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output: null,
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output: '<template>{{foo bar=(get this.list "0")}}</template>',
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errors: [{ messageId: 'noObscureArrayAccess' }],
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},
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{
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code: '<template>{{foo bar=@list.[1]}}</template>',
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output: null,
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output: '<template>{{foo bar=(get @list "1")}}</template>',
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errors: [{ messageId: 'noObscureArrayAccess' }],
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},
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{
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code: '<template>{{this.list.[0]}}</template>',
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output: null,
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output: '<template>{{get this.list "0"}}</template>',
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errors: [{ messageId: 'noObscureArrayAccess' }],
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},
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{
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code: '<template>{{this.list.[0].name}}</template>',
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output: null,
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output: '<template>{{get this.list "0.name"}}</template>',
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errors: [{ messageId: 'noObscureArrayAccess' }],
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},
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{
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code: '<template><Foo @bar={{this.list.[0]}} /></template>',
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output: null,
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output: '<template><Foo @bar={{get this.list "0"}} /></template>',
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errors: [{ messageId: 'noObscureArrayAccess' }],
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},
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{
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code: '<template><Foo @bar={{this.list.[0].name.[1].foo}} /></template>',
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output: null,
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output: '<template><Foo @bar={{get this.list "0.name.1.foo"}} /></template>',
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errors: [{ messageId: 'noObscureArrayAccess' }],
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},
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],
@@ -102,7 +102,7 @@ hbsRuleTester.run('template-no-obscure-array-access', rule, {
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invalid: [
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{
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code: '<Foo @onClick={{fn this.func @foo.0.bar}} />',
105-
output: null,
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output: '<Foo @onClick={{fn this.func (get @foo "0.bar")}} />',
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errors: [
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{
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message:
@@ -112,7 +112,7 @@ hbsRuleTester.run('template-no-obscure-array-access', rule, {
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},
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{
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code: '{{foo bar=this.list.[0]}}',
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output: null,
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output: '{{foo bar=(get this.list "0")}}',
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errors: [
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{
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message:
@@ -122,7 +122,7 @@ hbsRuleTester.run('template-no-obscure-array-access', rule, {
122122
},
123123
{
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code: '{{foo bar=@list.[1]}}',
125-
output: null,
125+
output: '{{foo bar=(get @list "1")}}',
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errors: [
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{
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message:
@@ -132,7 +132,7 @@ hbsRuleTester.run('template-no-obscure-array-access', rule, {
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},
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{
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code: '{{this.list.[0]}}',
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output: null,
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output: '{{get this.list "0"}}',
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errors: [
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{
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message:
@@ -142,7 +142,7 @@ hbsRuleTester.run('template-no-obscure-array-access', rule, {
142142
},
143143
{
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code: '{{this.list.[0].name}}',
145-
output: null,
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output: '{{get this.list "0.name"}}',
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errors: [
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{
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message:
@@ -152,7 +152,7 @@ hbsRuleTester.run('template-no-obscure-array-access', rule, {
152152
},
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{
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code: '<Foo @bar={{this.list.[0]}} />',
155-
output: null,
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output: '<Foo @bar={{get this.list "0"}} />',
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errors: [
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{
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message:
@@ -162,7 +162,7 @@ hbsRuleTester.run('template-no-obscure-array-access', rule, {
162162
},
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{
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code: '<Foo @bar={{this.list.[0].name.[1].foo}} />',
165-
output: null,
165+
output: '<Foo @bar={{get this.list "0.name.1.foo"}} />',
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errors: [
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{
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message:

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