120 lines
3.6 KiB
JavaScript
120 lines
3.6 KiB
JavaScript
/**
|
|
* @fileoverview Restrict usage of specified globals.
|
|
* @author Benoît Zugmeyer
|
|
*/
|
|
"use strict";
|
|
|
|
//------------------------------------------------------------------------------
|
|
// Helpers
|
|
//------------------------------------------------------------------------------
|
|
|
|
const DEFAULT_MESSAGE_TEMPLATE = "Unexpected use of '{{name}}'.",
|
|
CUSTOM_MESSAGE_TEMPLATE = "Unexpected use of '{{name}}'. {{customMessage}}";
|
|
|
|
//------------------------------------------------------------------------------
|
|
// Rule Definition
|
|
//------------------------------------------------------------------------------
|
|
|
|
module.exports = {
|
|
meta: {
|
|
docs: {
|
|
description: "disallow specified global variables",
|
|
category: "Variables",
|
|
recommended: false
|
|
},
|
|
|
|
schema: {
|
|
type: "array",
|
|
items: {
|
|
oneOf: [
|
|
{
|
|
type: "string"
|
|
},
|
|
{
|
|
type: "object",
|
|
properties: {
|
|
name: { type: "string" },
|
|
message: { type: "string" }
|
|
},
|
|
required: ["name"],
|
|
additionalProperties: false
|
|
}
|
|
]
|
|
},
|
|
uniqueItems: true,
|
|
minItems: 0
|
|
}
|
|
},
|
|
|
|
create(context) {
|
|
|
|
// If no globals are restricted, we don't need to do anything
|
|
if (context.options.length === 0) {
|
|
return {};
|
|
}
|
|
|
|
const restrictedGlobalMessages = context.options.reduce((memo, option) => {
|
|
if (typeof option === "string") {
|
|
memo[option] = null;
|
|
} else {
|
|
memo[option.name] = option.message;
|
|
}
|
|
|
|
return memo;
|
|
}, {});
|
|
|
|
/**
|
|
* Report a variable to be used as a restricted global.
|
|
* @param {Reference} reference the variable reference
|
|
* @returns {void}
|
|
* @private
|
|
*/
|
|
function reportReference(reference) {
|
|
const name = reference.identifier.name,
|
|
customMessage = restrictedGlobalMessages[name],
|
|
message = customMessage
|
|
? CUSTOM_MESSAGE_TEMPLATE
|
|
: DEFAULT_MESSAGE_TEMPLATE;
|
|
|
|
context.report({
|
|
node: reference.identifier,
|
|
message,
|
|
data: {
|
|
name,
|
|
customMessage
|
|
}
|
|
});
|
|
}
|
|
|
|
/**
|
|
* Check if the given name is a restricted global name.
|
|
* @param {string} name name of a variable
|
|
* @returns {boolean} whether the variable is a restricted global or not
|
|
* @private
|
|
*/
|
|
function isRestricted(name) {
|
|
return restrictedGlobalMessages.hasOwnProperty(name);
|
|
}
|
|
|
|
return {
|
|
Program() {
|
|
const scope = context.getScope();
|
|
|
|
// Report variables declared elsewhere (ex: variables defined as "global" by eslint)
|
|
scope.variables.forEach(variable => {
|
|
if (!variable.defs.length && isRestricted(variable.name)) {
|
|
variable.references.forEach(reportReference);
|
|
}
|
|
});
|
|
|
|
// Report variables not declared at all
|
|
scope.through.forEach(reference => {
|
|
if (isRestricted(reference.identifier.name)) {
|
|
reportReference(reference);
|
|
}
|
|
});
|
|
|
|
}
|
|
};
|
|
}
|
|
};
|