[Javascript AST] 3. Continue: Write ESLint rule
The rule we want to write is show warning if user using console method:
// valid
foo.console()
console()
info()
console.baz() // invalid
console.log()
console.info()
console.warn()
Rule:
const disallowedMethods = ["log", "info", "warn", "error", "dir"]; module.exports = {
meta: {
docs: {
description: "Disallow use of console",
category: "Best Practices",
recommended: true
}
},
create(context) {
return {
Identifier(node) {
const isConsoleCall = looksLike(node, {
name: "console",
parent: {
type: "MemberExpression",
property: {
name: val => disallowedMethods.includes(val)
}
}
});
// find the identifier with name 'console'
if (!isConsoleCall) {
return;
} context.report({
node,
message: "Using console is not allowed"
});
}
};
}
}; function looksLike(a, b) {
return (
a &&
b &&
Object.keys(b).every(bKey => {
const bVal = b[bKey];
const aVal = a[bKey];
if (typeof bVal === "function") {
return bVal(aVal);
}
return isPrimitive(bVal) ? bVal === aVal : looksLike(aVal, bVal);
})
);
} function isPrimitive(val) {
return val == null || /^[sbn]/.test(typeof val);
}
'looksLike' & isPrimitive is pretty handy, you can save as until lib.
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