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/**
* @fileoverview We shouldn't use global built-in object for security and
* performance reason. This linter rule reports replacable codes
* that can be replaced with primordials.
* @author Leko <leko.noor@gmail.com>
*/
'use strict';
//------------------------------------------------------------------------------
// Rule Definition
//------------------------------------------------------------------------------
function toPrimordialsName(obj, prop) {
return obj + toUcFirst(prop);
}
function toUcFirst(str) {
return str[0].toUpperCase() + str.slice(1);
}
function isTarget(map, varName) {
return map.has(varName);
}
function isIgnored(map, varName, propName) {
if (!map.has(varName) || !map.get(varName).has(propName)) {
return false;
}
return map.get(varName).get(propName).ignored;
}
function getReportName({ name, parentName, into }) {
if (into) {
return toPrimordialsName(into, name);
}
if (parentName) {
return toPrimordialsName(parentName, name);
}
return name;
}
/**
* Get identifier of object spread assignment
*
* code: 'const { ownKeys } = Reflect;'
* argument: 'ownKeys'
* return: 'Reflect'
*/
function getDestructuringAssignmentParent(scope, node) {
const declaration = scope.set.get(node.name);
if (
!declaration ||
!declaration.defs ||
declaration.defs.length === 0 ||
declaration.defs[0].type !== 'Variable' ||
!declaration.defs[0].node.init
) {
return null;
}
return declaration.defs[0].node.init.name;
}
const identifierSelector =
'[type!=VariableDeclarator][type!=MemberExpression]>Identifier';
module.exports = {
meta: {
messages: {
error: 'Use `const { {{name}} } = primordials;` instead of the global.'
}
},
create(context) {
const globalScope = context.getSourceCode().scopeManager.globalScope;
const nameMap = context.options.reduce((acc, option) =>
acc.set(
option.name,
(option.ignore || [])
.reduce((acc, name) => acc.set(name, {
ignored: true
}), new Map())
)
, new Map());
const renameMap = context.options
.filter((option) => option.into)
.reduce((acc, option) =>
acc.set(option.name, option.into)
, new Map());
let reported;
return {
Program() {
reported = new Map();
},
[identifierSelector](node) {
if (reported.has(node.range[0])) {
return;
}
const name = node.name;
const parentName = getDestructuringAssignmentParent(
context.getScope(),
node
);
if (!isTarget(nameMap, name) && !isTarget(nameMap, parentName)) {
return;
}
const defs = (globalScope.set.get(name) || {}).defs || null;
if (parentName && isTarget(nameMap, parentName)) {
if (!defs || defs[0].name.name !== 'primordials') {
reported.set(node.range[0], true);
const into = renameMap.get(name);
context.report({
node,
messageId: 'error',
data: {
name: getReportName({ into, parentName, name })
}
});
}
return;
}
if (defs.length === 0 || defs[0].node.init.name !== 'primordials') {
reported.set(node.range[0], true);
const into = renameMap.get(name);
context.report({
node,
messageId: 'error',
data: {
name: getReportName({ into, parentName, name })
}
});
}
},
MemberExpression(node) {
const obj = node.object.name;
const prop = node.property.name;
if (!prop || !isTarget(nameMap, obj) || isIgnored(nameMap, obj, prop)) {
return;
}
const variables =
context.getSourceCode().scopeManager.getDeclaredVariables(node);
if (variables.length === 0) {
context.report({
node,
messageId: 'error',
data: {
name: toPrimordialsName(obj, prop),
}
});
}
}
};
}
};
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