Merge branch 'master' into next

README.md

@@ -88,11 +88,10 @@ Use it with `fetch`, Axios or other data fetching libraries, even GraphQL.
 
 [abortable fetch]: https://developers.google.com/web/updates/2017/09/abortable-fetch
 
-> ## Upgrading to v8
+> ## Upgrading to v9
 >
-> Version 8 comes with breaking changes.
+> Version 9 comes with a minor breaking change.
 > See [Upgrading](https://docs.react-async.com/installation#upgrading) for details.
-> A [codemod](https://github.com/async-library/react-async/tree/master/codemods) is available.
 
 # Documentation
 

docs/state.md

@@ -108,9 +108,12 @@ The number of times a promise was started.
 
 > `Promise`
 
-A reference to the internal wrapper promise created when starting a new promise \(either automatically or by invoking `run` / `reload`\). It fulfills or rejects along with the provided `promise` / `promiseFn` / `deferFn`. Useful as a chainable alternative to the `onResolve` / `onReject` callbacks.
+A reference to the internal wrapper promise created when starting a new promise \(either automatically or by invoking
+`run` / `reload`\). It fulfills or rejects along with the provided `promise` / `promiseFn` / `deferFn`. Useful as a
+chainable alternative to the `onResolve` / `onReject` callbacks.
 
-Warning! If you chain on `promise`, you MUST provide a rejection handler \(e.g. `.catch(...)`\). Otherwise React will throw an exception and crash if the promise rejects.
+Warning! If you chain on `promise`, you MUST provide a rejection handler \(e.g. `.catch(...)`\). Otherwise React will
+throw an exception and crash if the promise rejects.
 
 ## `run`
 
@@ -120,15 +123,18 @@ Runs the `deferFn`, passing any arguments provided as an array.
 
 When used with `useFetch`, `run` has several overloaded signatures:
 
-> `function(resource: String | Resource, init: Object | (init: Object) => Object): void`
->
-> `function(init: Object | (init: Object) => Object): void`
+> `function(override: OverrideParams | (params: OverrideParams) => OverrideParams): void`
 >
 > `function(event: SyntheticEvent | Event): void`
 >
 > `function(): void`
 
-This way you can run the `fetch` request using the provided `resource` and `init`. `resource` can be omitted. If `init` is an object it will be spread over the default `init` \(`useFetch`'s 2nd argument\). If it's a function it will be invoked with the default `init` and should return a new `init` object. This way you can either extend or override the value of `init`, for example to set request headers.
+Where `type OverrideParams = { resource?: RequestInfo } & Partial<RequestInit>`.
+
+This way you can run the `fetch` request with custom `resource` and `init`. If `override` is an object it will be spread
+over the default `resource` and `init` for `fetch`. If it's a function it will be invoked with the params defined with
+`useFetch`, and should return an `override` object. This way you can either extend or override the value of `resource`
+and `init`, for example to change the URL or set custom request headers.
 
 ## `reload`
 

docs/upgrading.md

@@ -1,5 +1,11 @@
 # Upgrading
 
+## Upgrade to v9
+
+The rejection value for failed requests with `useFetch` was changed. Previously it was the Response object. Now it's an
+Error object with `response` property. If you are using `useFetch` and are using the `error` value, expecting it to be
+of type Response, you must now use `error.response` instead.
+
 ## Upgrade to v8
 
 All standalone helper components were renamed to avoid import naming collision.
@@ -12,7 +18,8 @@ All standalone helper components were renamed to avoid import naming collision.
 
 > A [codemod](https://github.com/async-library/react-async/tree/master/codemods) is available to automate the upgrade.
 
-The return type for `run` was changed from `Promise` to `undefined`. You should now use the `promise` prop instead. This is a manual upgrade. See [`promise`](installation.md#promise-1) for details.
+The return type for `run` was changed from `Promise` to `undefined`. You should now use the `promise` prop instead. This
+is a manual upgrade. See [`promise`](state.md#promise) for details.
 
 ## Upgrade to v6
 
@@ -25,11 +32,8 @@ The return type for `run` was changed from `Promise` to `undefined`. You should
 ## Upgrade to v4
 
 - `deferFn` now receives an `args` array as the first argument, instead of arguments to `run` being spread at the front
-
   of the arguments list. This enables better interop with TypeScript. You can use destructuring to keep using your
-
   existing variables.
 
 - The shorthand version of `useAsync` now takes the `options` object as optional second argument. This used to be
-
   `initialValue`, but was undocumented and inflexible.

packages/react-async/src/index.d.ts

@@ -227,11 +227,11 @@ type AsyncInitialWithout<K extends keyof AsyncInitial<T>, T> =
   | Omit<AsyncFulfilled<T>, K>
   | Omit<AsyncRejected<T>, K>
 
+type OverrideParams = { resource?: RequestInfo } & Partial<RequestInit>
+
 type FetchRun<T> = {
-  run(overrideResource: RequestInfo, overrideInit: (init: RequestInit) => RequestInit): void
-  run(overrideResource: RequestInfo, overrideInit: Partial<RequestInit>): void
-  run(overrideInit: (init: RequestInit) => RequestInit): void
-  run(overrideInit: Partial<RequestInit>): void
+  run(overrideParams: (params?: OverrideParams) => OverrideParams): void
+  run(overrideParams: OverrideParams): void
   run(ignoredEvent: React.SyntheticEvent): void
   run(ignoredEvent: Event): void
   run(): void

packages/react-async/src/reducer.js

@@ -1,6 +1,27 @@
 import { getInitialStatus, getIdleStatus, getStatusProps, statusTypes } from "./status"
 
-export const neverSettle = new Promise(() => {})
+// This exists to make sure we don't hold any references to user-provided functions
+class NeverSettle extends Promise {
+  constructor() {
+    super(() => {}, () => {})
+    /* istanbul ignore next */
+    if (Object.setPrototypeOf) {
+      // Not available in IE 10, but can be polyfilled
+      Object.setPrototypeOf(this, NeverSettle.prototype)
+    }
+  }
+  finally() {
+    return this
+  }
+  catch() {
+    return this
+  }
+  then() {
+    return this
+  }
+}
+
+export const neverSettle = new NeverSettle()
 
 export const actionTypes = {
   start: "start",

packages/react-async/src/useAsync.js

@@ -168,6 +168,11 @@ const useAsync = (arg1, arg2) => {
 export class FetchError extends Error {
   constructor(response) {
     super(`${response.status} ${response.statusText}`)
+    /* istanbul ignore next */
+    if (Object.setPrototypeOf) {
+      // Not available in IE 10, but can be polyfilled
+      Object.setPrototypeOf(this, FetchError.prototype)
+    }
     this.response = response
   }
 }
@@ -178,8 +183,6 @@ const parseResponse = (accept, json) => res => {
   return accept === "application/json" ? res.json() : res
 }
 
-const isResource = value => typeof value === "string" || (typeof value === "object" && value.url)
-
 const useAsyncFetch = (resource, init, { defer, json, ...options } = {}) => {
   const method = resource.method || (init && init.method)
   const headers = resource.headers || (init && init.headers) || {}
@@ -194,15 +197,17 @@ const useAsyncFetch = (resource, init, { defer, json, ...options } = {}) => {
     ...options,
     [fn]: useCallback(
       (arg1, arg2, arg3) => {
-        const [runArgs, signal] = isDefer ? [arg1, arg3.signal] : [[], arg2.signal]
-        const [runResource, runInit] = isResource(runArgs[0]) ? runArgs : [, runArgs[0]]
-        if (typeof runInit === "object" && "preventDefault" in runInit) {
-          // Don't spread Events or SyntheticEvents
-          return doFetch(runResource || resource, { signal, ...init })
+        const [override, signal] = isDefer ? [arg1[0], arg3.signal] : [undefined, arg2.signal]
+        const isEvent = typeof override === "object" && "preventDefault" in override
+        if (!override || isEvent) {
+          return doFetch(resource, { signal, ...init })
+        }
+        if (typeof override === "function") {
+          const { resource: runResource, ...runInit } = override({ resource, signal, ...init })
+          return doFetch(runResource || resource, { signal, ...runInit })
         }
-        return typeof runInit === "function"
-          ? doFetch(runResource || resource, { signal, ...runInit(init) })
-          : doFetch(runResource || resource, { signal, ...init, ...runInit })
+        const { resource: runResource, ...runInit } = override
+        return doFetch(runResource || resource, { signal, ...init, ...runInit })
       },
       [identity] // eslint-disable-line react-hooks/exhaustive-deps
     ),
@@ -211,6 +216,7 @@ const useAsyncFetch = (resource, init, { defer, json, ...options } = {}) => {
   return state
 }
 
+/* istanbul ignore next */
 const unsupported = () => {
   throw new Error(
     "useAsync requires React v16.8 or up. Upgrade your React version or use the <Async> component instead."

packages/react-async/src/useAsync.spec.js

@@ -203,61 +203,27 @@ describe("useFetch", () => {
     expect(json).toHaveBeenCalled()
   })
 
-  test("calling `run` with a callback as argument allows to override `init` parameters", () => {
+  test("calling `run` with a callback as argument allows to override fetch parameters", () => {
+    const override = params => ({ ...params, resource: "/bar", body: '{"name":"bar"}' })
     const component = (
-      <Fetch input="/test" init={{ method: "POST", body: '{"name":"foo"}' }}>
-        {({ run }) => (
-          <button onClick={() => run(init => ({ ...init, body: '{"name":"bar"}' }))}>run</button>
-        )}
-      </Fetch>
-    )
-    const { getByText } = render(component)
-    expect(globalScope.fetch).not.toHaveBeenCalled()
-    fireEvent.click(getByText("run"))
-    expect(globalScope.fetch).toHaveBeenCalledWith(
-      "/test",
-      expect.objectContaining({ method: "POST", signal: abortCtrl.signal, body: '{"name":"bar"}' })
-    )
-  })
-
-  test("calling `run` with an object as argument allows to override `init` parameters", () => {
-    const component = (
-      <Fetch input="/test" init={{ method: "POST", body: '{"name":"foo"}' }}>
-        {({ run }) => <button onClick={() => run({ body: '{"name":"bar"}' })}>run</button>}
-      </Fetch>
-    )
-    const { getByText } = render(component)
-    expect(globalScope.fetch).not.toHaveBeenCalled()
-    fireEvent.click(getByText("run"))
-    expect(globalScope.fetch).toHaveBeenCalledWith(
-      "/test",
-      expect.objectContaining({ method: "POST", signal: abortCtrl.signal, body: '{"name":"bar"}' })
-    )
-  })
-
-  test("calling `run` with a url allows to override fetch's `resource` parameter", () => {
-    const component = (
-      <Fetch input="/foo" options={{ defer: true }}>
-        {({ run }) => <button onClick={() => run("/bar")}>run</button>}
+      <Fetch input="/foo" init={{ method: "POST", body: '{"name":"foo"}' }}>
+        {({ run }) => <button onClick={() => run(override)}>run</button>}
       </Fetch>
     )
     const { getByText } = render(component)
     expect(globalScope.fetch).not.toHaveBeenCalled()
     fireEvent.click(getByText("run"))
     expect(globalScope.fetch).toHaveBeenCalledWith(
       "/bar",
-      expect.objectContaining({ signal: abortCtrl.signal })
+      expect.objectContaining({ method: "POST", signal: abortCtrl.signal, body: '{"name":"bar"}' })
     )
   })
 
-  test("overriding the `resource` can be combined with overriding `init`", () => {
+  test("calling `run` with an object as argument allows to override fetch parameters", () => {
+    const override = { resource: "/bar", body: '{"name":"bar"}' }
     const component = (
       <Fetch input="/foo" init={{ method: "POST", body: '{"name":"foo"}' }}>
-        {({ run }) => (
-          <button onClick={() => run("/bar", init => ({ ...init, body: '{"name":"bar"}' }))}>
-            run
-          </button>
-        )}
+        {({ run }) => <button onClick={() => run(override)}>run</button>}
       </Fetch>
     )
     const { getByText } = render(component)

stories/index.stories.js

@@ -1,3 +1,4 @@
+/* eslint-disable react/prop-types */
 import React, { Suspense } from "react"
 import { storiesOf } from "@storybook/react"