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-# gensync
-
-This module allows for developers to write common code that can share
-implementation details, hiding whether an underlying request happens
-synchronously or asynchronously. This is in contrast with many current Node
-APIs which explicitly implement the same API twice, once with calls to
-synchronous functions, and once with asynchronous functions.
-
-Take for example `fs.readFile` and `fs.readFileSync`, if you're writing an API
-that loads a file and then performs a synchronous operation on the data, it
-can be frustrating to maintain two parallel functions.
-
-
-## Example
-
-```js
-const fs = require("fs");
-const gensync = require("gensync");
-
-const readFile = gensync({
-  sync: fs.readFileSync,
-  errback: fs.readFile,
-});
-
-const myOperation = gensync(function* (filename) {
-  const code = yield* readFile(filename, "utf8");
-
-  return "// some custom prefix\n" + code;
-});
-
-// Load and add the prefix synchronously:
-const result = myOperation.sync("./some-file.js");
-
-// Load and add the prefix asynchronously with promises:
-myOperation.async("./some-file.js").then(result => {
-
-});
-
-// Load and add the prefix asynchronously with promises:
-myOperation.errback("./some-file.js", (err, result) => {
-
-});
-```
-
-This could even be exposed as your official API by doing
-```js
-// Using the common 'Sync' suffix for sync functions, and 'Async' suffix for
-// promise-returning versions.
-exports.myOperationSync = myOperation.sync;
-exports.myOperationAsync = myOperation.async;
-exports.myOperation = myOperation.errback;
-```
-or potentially expose one of the async versions as the default, with a
-`.sync` property on the function to expose the synchronous version.
-```js
-module.exports = myOperation.errback;
-module.exports.sync = myOperation.sync;
-````
-
-
-## API
-
-### gensync(generatorFnOrOptions)
-
-Returns a function that can be "await"-ed in another `gensync` generator
-function, or executed via
-
-* `.sync(...args)` - Returns the computed value, or throws.
-* `.async(...args)` - Returns a promise for the computed value.
-* `.errback(...args, (err, result) => {})` - Calls the callback with the computed value, or error.
-
-
-#### Passed a generator
-
-Wraps the generator to populate the `.sync`/`.async`/`.errback` helpers above to
-allow for evaluation of the generator for the final value.
-
-##### Example
-
-```js
-const readFile = function* () {
-  return 42;
-};
-
-const readFileAndMore = gensync(function* (){
-  const val = yield* readFile();
-  return 42 + val;
-});
-
-// In general cases
-const code = readFileAndMore.sync("./file.js", "utf8");
-readFileAndMore.async("./file.js", "utf8").then(code => {})
-readFileAndMore.errback("./file.js", "utf8", (err, code) => {});
-
-// In a generator being called indirectly with .sync/.async/.errback
-const code = yield* readFileAndMore("./file.js", "utf8");
-```
-
-
-#### Passed an options object
-
-* `opts.sync`
-
-  Example: `(...args) => 4`
-
-  A function that will be called when `.sync()` is called on the `gensync()`
-  result, or when the result is passed to `yield*` in another generator that
-  is being run synchronously.
-
-  Also called for `.async()` calls if no async handlers are provided.
-
-* `opts.async`
-
-  Example: `async (...args) => 4`
-
-  A function that will be called when `.async()` or `.errback()` is called on
-  the `gensync()` result, or when the result is passed to `yield*` in another
-  generator that is being run asynchronously.
-
-* `opts.errback`
-
-  Example: `(...args, cb) => cb(null, 4)`
-
-  A function that will be called when `.async()` or `.errback()` is called on
-  the `gensync()` result, or when the result is passed to `yield*` in another
-  generator that is being run asynchronously.
-
-  This option allows for simpler compatibility with many existing Node APIs,
-  and also avoids introducing the extra even loop turns that promises introduce
-  to access the result value.
-
-* `opts.name`
-
-  Example: `"readFile"`
-
-  A string name to apply to the returned function. If no value is provided,
-  the name of `errback`/`async`/`sync` functions will be used, with any
-  `Sync` or `Async` suffix stripped off. If the callback is simply named
-  with ES6 inference (same name as the options property), the name is ignored.
-
-* `opts.arity`
-
-  Example: `4`
-
-  A number for the length to set on the returned function. If no value
-  is provided, the length will be carried over from the `sync` function's
-  `length` value.
-
-##### Example
-
-```js
-const readFile = gensync({
-  sync: fs.readFileSync,
-  errback: fs.readFile,
-});
-
-const code = readFile.sync("./file.js", "utf8");
-readFile.async("./file.js", "utf8").then(code => {})
-readFile.errback("./file.js", "utf8", (err, code) => {});
-```
-
-
-### gensync.all(iterable)
-
-`Promise.all`-like combinator that works with an iterable of generator objects
-that could be passed to `yield*` within a gensync generator.
-
-#### Example
-
-```js
-const loadFiles = gensync(function* () {
-  return yield* gensync.all([
-    readFile("./one.js"),
-    readFile("./two.js"),
-    readFile("./three.js"),
-  ]);
-});
-```
-
-
-### gensync.race(iterable)
-
-`Promise.race`-like combinator that works with an iterable of generator objects
-that could be passed to `yield*` within a gensync generator.
-
-#### Example
-
-```js
-const loadFiles = gensync(function* () {
-  return yield* gensync.race([
-    readFile("./one.js"),
-    readFile("./two.js"),
-    readFile("./three.js"),
-  ]);
-});
-```