Convert @bugsnag/core/lib/metadata-delegate to TypeScript

packages/core/package.json

@@ -15,7 +15,6 @@
     "./lib/es-utils/reduce": "./src/lib/es-utils/reduce.js",
     "./lib/es-utils/keys": "./src/lib/es-utils/keys.js",
     "./lib/derecursify": "./src/lib/derecursify.js",
-    "./lib/metadata-delegate": "./src/lib/metadata-delegate.js",
     "./lib/callback-runner": "./src/lib/callback-runner.js",
     "./lib/path-normalizer": "./src/lib/path-normalizer.js",
     "./lib/validators/string-with-length": "./src/lib/validators/string-with-length.js",

packages/core/src/client.ts

@@ -116,15 +116,15 @@ export default class Client<T extends Config = Config> {
     }
   }
 
-  addMetadata (section: string, keyOrObj: any, maybeVal?: any) {
+  addMetadata (section: string, keyOrObj: object | string, maybeVal?: any) {
     return metadataDelegate.add(this._metadata, section, keyOrObj, maybeVal)
   }
 
-  getMetadata (section: string, key?: any) {
+  getMetadata (section: string, key?: string) {
     return metadataDelegate.get(this._metadata, section, key)
   }
 
-  clearMetadata (section: string, key?: any) {
+  clearMetadata (section: string, key?: string) {
     return metadataDelegate.clear(this._metadata, section, key)
   }
 

packages/core/src/event.ts

@@ -85,7 +85,7 @@ export default class Event {
     /* this.attemptImmediateDelivery, default: true */
   }
 
-  addMetadata (section: string, keyOrObj?: any, maybeVal?: any) {
+  addMetadata (section: string, keyOrObj?: object | string, maybeVal?: any) {
     return metadataDelegate.add(this._metadata, section, keyOrObj, maybeVal)
   }
 

packages/core/src/index.ts

@@ -7,6 +7,7 @@ export { default as cloneClient } from './lib/clone-client'
 export { default as jsonPayload } from './lib/json-payload'
 export { default as intRange } from './lib/validators/int-range'
 export { default as isError } from './lib/iserror'
+export { default as metadataDelegate } from './lib/metadata-delegate'
 export { default as nodeFallbackStack } from './lib/node-fallback-stack'
 export { default as runSyncCallbacks } from './lib/sync-callback-runner'
 

packages/core/src/lib/metadata-delegate.ts

@@ -0,0 +1,70 @@
+import assign from './es-utils/assign'
+
+interface MetadataDelegate {
+  add: (state: { [key: string]: any }, section: string, keyOrObj?: object | string, maybeVal?: any) => any
+  get: (state: { [key: string]: any }, section: string, key?: string) => any
+  clear: (state: { [key: string]: any }, section: string, key?: string) => any
+}
+
+const metadataDelegate: MetadataDelegate = {
+  add: (state, section, keyOrObj, maybeVal) => {
+    if (!section) return
+    let updates
+
+    // addMetadata("section", null) -> clears section
+    if (keyOrObj === null) return metadataDelegate.clear(state, section);
+
+    // normalise the two supported input types into object form
+    if (typeof keyOrObj === 'object') updates = keyOrObj
+    if (typeof keyOrObj === 'string') updates = { [keyOrObj]: maybeVal }
+
+    // exit if we don't have an updates object at this point
+    if (!updates) return
+
+    // preventing the __proto__ property from being used as a key
+    if (section === '__proto__' || section === 'constructor' || section === 'prototype') {
+      return
+    }
+
+    // ensure a section with this name exists
+    if (!state[section]) state[section] = {}
+
+    // merge the updates with the existing section
+    state[section] = assign({}, state[section], updates)
+  },
+
+  get: (state, section, key) => {
+    if (typeof section !== 'string') return undefined
+    if (!key) {
+      return state[section]
+    }
+    if (state[section]) {
+      return state[section][key]
+    }
+    return undefined
+  },
+
+  clear: (state, section, key) => {
+    if (typeof section !== 'string') return
+
+    // clear an entire section
+    if (!key) {
+      // eslint-disable-next-line @typescript-eslint/no-dynamic-delete
+      delete state[section]
+      return
+    }
+
+    // preventing the __proto__ property from being used as a key
+    if (section === '__proto__' || section === 'constructor' || section === 'prototype') {
+      return
+    }
+
+    // clear a single value from a section
+    if (state[section]) {
+      // eslint-disable-next-line @typescript-eslint/no-dynamic-delete
+      delete state[section][key]
+    }
+  }
+}
+
+export default metadataDelegate;

packages/core/test/metadata-delegate.test.js

@@ -1,4 +1,4 @@
-import { add, clear } from '../src/lib/metadata-delegate'
+import metadataDelegate from '../src/lib/metadata-delegate'
 
 // it doesn't seem easy or even impossible to check whether __proto__ keys can be overwritten
 // https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Object/proto
@@ -17,7 +17,7 @@ describe('metadata delegate', () => {
       }
     ])('should not add $key keys', ({ key, expected }) => {
       const state = {}
-      add(state, key, 'foo', 'bar')
+      metadataDelegate.add(state, key, "foo", "bar");
       expect(state).toEqual(expected)
     })
   })
@@ -51,7 +51,7 @@ describe('metadata delegate', () => {
         }
       }
     ])('should not overwrite $key keys', ({ key, state, expected }) => {
-      clear(state, key, 'foo')
+      metadataDelegate.clear(state, key, "foo");
       expect(state).toEqual(expected)
     })
   })