| 1 | interface FiberConstructor {
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| 2 | /**
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| 3 | * Instantiate a new Fiber. You may invoke this either as a function or as
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| 4 | * a constructor; the behavior is the same.
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| 5 | *
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| 6 | * When run() is called on this fiber for the first time, `fn` will be
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| 7 | * invoked as the first frame on a new stack. Execution will continue on
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| 8 | * this new stack until `fn` returns, or Fiber.yield() is called.
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| 9 | *
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| 10 | * After the function returns the fiber is reset to original state and
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| 11 | * may be restarted with another call to run().
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| 12 | */
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| 13 | new(fn: Function): Fiber;
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| 14 | (fn: Function): Fiber;
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| 15 |
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| 16 | /**
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| 17 | * `Fiber.current` will contain the currently-running Fiber. It will be
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| 18 | * `undefined` if there is no fiber (i.e. the main stack of execution).
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| 19 | *
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| 20 | * See "Garbage Collection" for more information on responsible use of
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| 21 | * `Fiber.current`.
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| 22 | */
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| 23 | readonly current?: Fiber | undefined;
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| 24 |
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| 25 | /**
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| 26 | * `Fiber.yield()` will halt execution of the current fiber and return control
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| 27 | * back to original caller of run(). If an argument is supplied to yield(),
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| 28 | * run() will return that value.
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| 29 | *
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| 30 | * When run() is called again, yield() will return.
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| 31 | *
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| 32 | * Note that this function is a global to allow for correct garbage
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| 33 | * collection. This results in no loss of functionality because it is only
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| 34 | * valid to yield from the currently running fiber anyway.
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| 35 | *
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| 36 | * Note also that `yield` is a reserved word in Javascript. This is normally
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| 37 | * not an issue, however some code linters may complain. Rest assured that it
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| 38 | * will run fine now and in future versions of Javascript.
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| 39 | */
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| 40 | yield<T = any, R = any>(param?: R): T;
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| 41 | }
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| 42 |
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| 43 | interface Fiber {
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| 44 | /**
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| 45 | * run() will start execution of this Fiber, or if it is currently yielding,
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| 46 | * it will resume execution. If an argument is supplied, this argument will
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| 47 | * be passed to the fiber, either as the first parameter to the main
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| 48 | * function [if the fiber has not been started] or as the return value of
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| 49 | * yield() [if the fiber is currently yielding].
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| 50 | *
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| 51 | * This function will return either the parameter passed to yield(), or the
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| 52 | * returned value from the fiber's main function.
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| 53 | */
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| 54 | run<T = any, R = any>(param?: T): R;
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| 55 |
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| 56 | /**
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| 57 | * reset() will terminate a running Fiber and restore it to its original
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| 58 | * state, as if it had returned execution.
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| 59 | *
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| 60 | * This is accomplished by causing yield() to throw an exception, and any
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| 61 | * futher calls to yield() will also throw an exception. This continues
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| 62 | * until the fiber has completely unwound and returns.
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| 63 | *
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| 64 | * If the fiber returns a value it will be returned by reset().
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| 65 | *
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| 66 | * If the fiber is not running, reset() will have no effect.
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| 67 | */
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| 68 | reset<T = any>(): T;
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| 69 |
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| 70 | /**
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| 71 | * throwInto() will cause a currently yielding fiber's yield() call to
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| 72 | * throw instead of return gracefully. This can be useful for notifying a
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| 73 | * fiber that you are no longer interested in its task, and that it should
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| 74 | * give up.
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| 75 | *
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| 76 | * Note that if the fiber does not handle the exception it will continue to
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| 77 | * bubble up and throwInto() will throw the exception right back at you.
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| 78 | */
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| 79 | throwInto(exception: Error): void;
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| 80 | }
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| 81 |
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| 82 | declare const Fiber: FiberConstructor;
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| 83 | export = Fiber;
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