eslint-plugin-lit
Version:
lit-html support for ESLint
50 lines (49 loc) • 2.01 kB
JavaScript
/**
* @fileoverview Disallows array `.map` in templates
* @author James Garbutt <https://github.com/43081j>
*/
//------------------------------------------------------------------------------
// Rule Definition
//------------------------------------------------------------------------------
export const rule = {
meta: {
docs: {
description: 'Disallows array `.map` in templates',
recommended: false,
url: 'https://github.com/43081j/eslint-plugin-lit/blob/master/docs/rules/no-template-map.md'
},
schema: [],
messages: {
noMap: '`.map` is disallowed in templates, move the expression out' +
' of the template instead'
}
},
create(context) {
// variables should be defined here
//----------------------------------------------------------------------
// Helpers
//----------------------------------------------------------------------
//----------------------------------------------------------------------
// Public
//----------------------------------------------------------------------
return {
TaggedTemplateExpression: (node) => {
if (node.type === 'TaggedTemplateExpression' &&
node.tag.type === 'Identifier' &&
node.tag.name === 'html') {
for (const expr of node.quasi.expressions) {
if (expr.type === 'CallExpression' &&
expr.callee.type === 'MemberExpression' &&
expr.callee.property.type === 'Identifier' &&
expr.callee.property.name === 'map') {
context.report({
node: expr,
messageId: 'noMap'
});
}
}
}
}
};
}
};