/
no-invalid-this.js
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/
no-invalid-this.js
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import cloneDeep from "lodash/cloneDeep";
import rule from "../../src/rules/no-invalid-this";
import RuleTester from "../../../babel-eslint-shared-fixtures/utils/RuleTester";
/**
* A constant value for non strict mode environment.
* @returns {void}
*/
function NORMAL(pattern) {
pattern.parserOptions.sourceType = "script";
}
/**
* A constant value for strict mode environment.
* This modifies pattern object to make strict mode.
* @param {Object} pattern - A pattern object to modify.
* @returns {void}
*/
function USE_STRICT(pattern) {
pattern.code = '"use strict"; ' + pattern.code;
}
/**
* A constant value for implied strict mode.
* This modifies pattern object to impose strict mode.
* @param {Object} pattern - A pattern object to modify.
* @returns {void}
*/
function IMPLIED_STRICT(pattern) {
pattern.code = "/* implied strict mode */ " + pattern.code;
pattern.parserOptions.ecmaFeatures = pattern.parserOptions.ecmaFeatures || {};
pattern.parserOptions.ecmaFeatures.impliedStrict = true;
}
/**
* A constant value for modules environment.
* This modifies pattern object to make modules.
* @param {Object} pattern - A pattern object to modify.
* @returns {void}
*/
function MODULES(pattern) {
pattern.code = "/* modules */ " + pattern.code;
}
/**
* Extracts patterns each condition for a specified type. The type is `valid` or `invalid`.
* @param {Object[]} patterns - Original patterns.
* @param {string} type - One of `"valid"` or `"invalid"`.
* @returns {Object[]} Test patterns.
*/
function extractPatterns(patterns, type) {
// Clone and apply the pattern environment.
const patternsList = patterns.map(function (pattern) {
return pattern[type].map(function (applyCondition) {
const thisPattern = cloneDeep(pattern);
applyCondition(thisPattern);
if (type === "valid") {
thisPattern.errors = [];
} else {
thisPattern.code += " /* should error */";
}
delete thisPattern.invalid;
delete thisPattern.valid;
return thisPattern;
});
});
// Flatten.
return Array.prototype.concat.apply([], patternsList);
}
//------------------------------------------------------------------------------
// Tests
//------------------------------------------------------------------------------
const patterns = [
// Class private fields
{
code: "class A {a = this.b;};",
parserOptions: { ecmaVersion: 6 },
valid: [NORMAL, USE_STRICT, IMPLIED_STRICT, MODULES],
invalid: [],
},
{
code: "class A {a = () => {return this.b;};};",
parserOptions: { ecmaVersion: 6 },
valid: [NORMAL, USE_STRICT, IMPLIED_STRICT, MODULES],
invalid: [],
},
{
code: "class A {a = () => { function b() { return this.b;} };};",
parserOptions: { ecmaVersion: 6 },
valid: [],
invalid: [NORMAL, USE_STRICT, IMPLIED_STRICT, MODULES],
errors: [
{
message: "Unexpected 'this'.",
},
],
},
{
code: "class A {a = () => { (function b() { return this.b;}); };};",
parserOptions: { ecmaVersion: 6 },
valid: [],
invalid: [NORMAL, USE_STRICT, IMPLIED_STRICT, MODULES],
errors: [
{
message: "Unexpected 'this'.",
},
],
},
// Class Private methods
{
code: "class A {#a = this.b;};",
parserOptions: { ecmaVersion: 6 },
valid: [NORMAL, USE_STRICT, IMPLIED_STRICT, MODULES],
invalid: [],
},
{
code: "class A {#a = () => {return this.b;};};",
parserOptions: { ecmaVersion: 6 },
valid: [NORMAL, USE_STRICT, IMPLIED_STRICT, MODULES],
invalid: [],
},
{
code: "class A {#a = () => { function b() { return this.b;} };};",
parserOptions: { ecmaVersion: 6 },
valid: [],
invalid: [NORMAL, USE_STRICT, IMPLIED_STRICT, MODULES],
errors: [
{
message: "Unexpected 'this'.",
},
],
},
{
code: "class A {#a = () => { (function b() { return this.b;}); };};",
parserOptions: { ecmaVersion: 6 },
valid: [],
invalid: [NORMAL, USE_STRICT, IMPLIED_STRICT, MODULES],
errors: [
{
message: "Unexpected 'this'.",
},
],
},
{
code: "class A {#a() {return this.b;};};",
parserOptions: { ecmaVersion: 6 },
valid: [NORMAL, USE_STRICT, IMPLIED_STRICT, MODULES],
invalid: [],
},
];
const ruleTester = new RuleTester();
ruleTester.run("@babel/no-invalid-this", rule, {
valid: extractPatterns(patterns, "valid"),
invalid: extractPatterns(patterns, "invalid"),
});