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?? any.js(421 B)
?? assert.js(1.61 KB)
?? async.js(4.05 KB)
?? bind.js(1.92 KB)
?? bluebird.js(291 B)
?? call_get.js(4.25 KB)
?? cancel.js(3.62 KB)
?? catch_filter.js(1.39 KB)
?? context.js(2.33 KB)
?? debuggability.js(29.63 KB)
?? direct_resolve.js(1.36 KB)
?? each.js(789 B)
?? errors.js(3.63 KB)
?? es5.js(1.93 KB)
?? filter.js(314 B)
?? finally.js(4.5 KB)
?? generators.js(7.58 KB)
?? join.js(8.03 KB)
?? map.js(5.25 KB)
?? method.js(1.73 KB)
?? nodeback.js(1.52 KB)
?? nodeify.js(1.61 KB)
?? promise.js(25.59 KB)
?? promise_array.js(5.08 KB)
?? promisify.js(11.9 KB)
?? props.js(3.04 KB)
?? queue.js(1.83 KB)
?? race.js(1.22 KB)
?? reduce.js(5.01 KB)
?? schedule.js(2.1 KB)
?? settle.js(1.23 KB)
?? some.js(3.87 KB)
?? synchronous_inspection.js(2.75 KB)
?? thenables.js(2.08 KB)
?? timers.js(2.34 KB)
?? using.js(7.35 KB)
?? util.js(10.28 KB)

Editing: finally.js

"use strict";
module.exports = function(Promise, tryConvertToPromise, NEXT_FILTER) {
var util = require("./util");
var CancellationError = Promise.CancellationError;
var errorObj = util.errorObj;
var catchFilter = require("./catch_filter")(NEXT_FILTER);

function PassThroughHandlerContext(promise, type, handler) {
    this.promise = promise;
    this.type = type;
    this.handler = handler;
    this.called = false;
    this.cancelPromise = null;
}

PassThroughHandlerContext.prototype.isFinallyHandler = function() {
    return this.type === 0;
};

function FinallyHandlerCancelReaction(finallyHandler) {
    this.finallyHandler = finallyHandler;
}

FinallyHandlerCancelReaction.prototype._resultCancelled = function() {
    checkCancel(this.finallyHandler);
};

function succeed() {
    return finallyHandler.call(this, this.promise._target()._settledValue());
}
function fail(reason) {
    if (checkCancel(this, reason)) return;
    errorObj.e = reason;
    return errorObj;
}
function finallyHandler(reasonOrValue) {
    var promise = this.promise;
    var handler = this.handler;

if (!this.called) {
        this.called = true;
        var ret = this.isFinallyHandler()
            ? handler.call(promise._boundValue())
            : handler.call(promise._boundValue(), reasonOrValue);
        if (ret === NEXT_FILTER) {
            return ret;
        } else if (ret !== undefined) {
            promise._setReturnedNonUndefined();
            var maybePromise = tryConvertToPromise(ret, promise);
            if (maybePromise instanceof Promise) {
                if (this.cancelPromise != null) {
                    if (maybePromise._isCancelled()) {
                        var reason =
                            new CancellationError("late cancellation observer");
                        promise._attachExtraTrace(reason);
                        errorObj.e = reason;
                        return errorObj;
                    } else if (maybePromise.isPending()) {
                        maybePromise._attachCancellationCallback(
                            new FinallyHandlerCancelReaction(this));
                    }
                }
                return maybePromise._then(
                    succeed, fail, undefined, this, undefined);
            }
        }
    }

if (promise.isRejected()) {
        checkCancel(this);
        errorObj.e = reasonOrValue;
        return errorObj;
    } else {
        checkCancel(this);
        return reasonOrValue;
    }
}

Promise.prototype._passThrough = function(handler, type, success, fail) {
    if (typeof handler !== "function") return this.then();
    return this._then(success,
                      fail,
                      undefined,
                      new PassThroughHandlerContext(this, type, handler),
                      undefined);
};

Promise.prototype.lastly =
Promise.prototype["finally"] = function (handler) {
    return this._passThrough(handler,
                             0,
                             finallyHandler,
                             finallyHandler);
};

Promise.prototype.tap = function (handler) {
    return this._passThrough(handler, 1, finallyHandler);
};

Promise.prototype.tapCatch = function (handlerOrPredicate) {
    var len = arguments.length;
    if(len === 1) {
        return this._passThrough(handlerOrPredicate,
                                 1,
                                 undefined,
                                 finallyHandler);
    } else {
         var catchInstances = new Array(len - 1),
            j = 0, i;
        for (i = 0; i < len - 1; ++i) {
            var item = arguments[i];
            if (util.isObject(item)) {
                catchInstances[j++] = item;
            } else {
                return Promise.reject(new TypeError(
                    "tapCatch statement predicate: "
                    + "expecting an object but got " + util.classString(item)
                ));
            }
        }
        catchInstances.length = j;
        var handler = arguments[i];
        return this._passThrough(catchFilter(catchInstances, handler, this),
                                 1,
                                 undefined,
                                 finallyHandler);
    }

};

return PassThroughHandlerContext;
};

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Editing: finally.js

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