add pollyfils option

packages/eslint-plugin-ecmascript-compat/lib/delegation.js

@@ -1,5 +1,6 @@
 function createDelegatee(config, rootContext) {
  const { definition, options } = config;
+ const pollyfils = (rootContext.options && rootContext.options[0] && rootContext.options[0].polyfills) || [];
 
  // All methods except report() are added later. Define necessary ones for used rules.
  const contextLaterAddedMethods = {
@@ -15,11 +16,26 @@ function createDelegatee(config, rootContext) {
  report,
  };
 
+ function matchesPollyfil(data, pollyfil) {
+ if (data.message) {
+ return data.message.includes(`'${pollyfil}'`)
+ }
+ if (data.name) {
+ return data.name === pollyfil;
+ }
+ return false;
+ }
+
  function report(params) {
  // Discard fixer; we can't declare the rule as fixable because not all delegatees are.
  // Look up messageId on delegate meta; report() would look it up on root rule meta.
  const { fix, message, messageId, ...otherParams } = params;
 
+ // Skip report if known polyfill exists
+ if (params.data && pollyfils.some(pollyfil => matchesPollyfil(params.data, pollyfil))) {
+ return;
+ }
+
  rootContext.report({
  ...otherParams,
  message: messageId ? definition.meta.messages[messageId] : message,

packages/eslint-plugin-ecmascript-compat/lib/rule.js

@@ -11,7 +11,20 @@ const delegateeConfigs = compatibility
 module.exports = {
  meta: {
  type: 'problem',
- schema: [], // no options
+ schema: [
+ {
+ "type": "object",
+ "properties": {
+ "pollyfils": {
+ "type": "array",
+ "items": {
+ "type": "string"
+ }
+ }
+ },
+ "additionalProperties": "false",
+ }
+ ]
  },
  create(context) {
  const visitors = delegateeConfigs.map((config) => createDelegatee(config, context));