1 | /**
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2 | * Async Hooks module: https://nodejs.org/api/async_hooks.html
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3 | */
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4 | declare module "async_hooks" {
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5 | /**
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6 | * Returns the asyncId of the current execution context.
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7 | */
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8 | function executionAsyncId(): number;
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9 |
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10 | /**
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11 | * The resource representing the current execution.
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12 | * Useful to store data within the resource.
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13 | *
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14 | * Resource objects returned by `executionAsyncResource()` are most often internal
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15 | * Node.js handle objects with undocumented APIs. Using any functions or properties
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16 | * on the object is likely to crash your application and should be avoided.
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17 | *
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18 | * Using `executionAsyncResource()` in the top-level execution context will
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19 | * return an empty object as there is no handle or request object to use,
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20 | * but having an object representing the top-level can be helpful.
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21 | */
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22 | function executionAsyncResource(): object;
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23 |
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24 | /**
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25 | * Returns the ID of the resource responsible for calling the callback that is currently being executed.
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26 | */
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27 | function triggerAsyncId(): number;
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28 |
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29 | interface HookCallbacks {
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30 | /**
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31 | * Called when a class is constructed that has the possibility to emit an asynchronous event.
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32 | * @param asyncId a unique ID for the async resource
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33 | * @param type the type of the async resource
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34 | * @param triggerAsyncId the unique ID of the async resource in whose execution context this async resource was created
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35 | * @param resource reference to the resource representing the async operation, needs to be released during destroy
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36 | */
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37 | init?(asyncId: number, type: string, triggerAsyncId: number, resource: object): void;
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38 |
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39 | /**
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40 | * When an asynchronous operation is initiated or completes a callback is called to notify the user.
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41 | * The before callback is called just before said callback is executed.
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42 | * @param asyncId the unique identifier assigned to the resource about to execute the callback.
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43 | */
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44 | before?(asyncId: number): void;
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45 |
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46 | /**
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47 | * Called immediately after the callback specified in before is completed.
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48 | * @param asyncId the unique identifier assigned to the resource which has executed the callback.
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49 | */
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50 | after?(asyncId: number): void;
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51 |
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52 | /**
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53 | * Called when a promise has resolve() called. This may not be in the same execution id
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54 | * as the promise itself.
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55 | * @param asyncId the unique id for the promise that was resolve()d.
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56 | */
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57 | promiseResolve?(asyncId: number): void;
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58 |
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59 | /**
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60 | * Called after the resource corresponding to asyncId is destroyed
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61 | * @param asyncId a unique ID for the async resource
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62 | */
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63 | destroy?(asyncId: number): void;
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64 | }
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65 |
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66 | interface AsyncHook {
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67 | /**
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68 | * Enable the callbacks for a given AsyncHook instance. If no callbacks are provided enabling is a noop.
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69 | */
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70 | enable(): this;
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71 |
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72 | /**
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73 | * Disable the callbacks for a given AsyncHook instance from the global pool of AsyncHook callbacks to be executed. Once a hook has been disabled it will not be called again until enabled.
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74 | */
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75 | disable(): this;
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76 | }
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77 |
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78 | /**
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79 | * Registers functions to be called for different lifetime events of each async operation.
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80 | * @param options the callbacks to register
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81 | * @return an AsyncHooks instance used for disabling and enabling hooks
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82 | */
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83 | function createHook(options: HookCallbacks): AsyncHook;
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84 |
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85 | interface AsyncResourceOptions {
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86 | /**
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87 | * The ID of the execution context that created this async event.
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88 | * Default: `executionAsyncId()`
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89 | */
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90 | triggerAsyncId?: number;
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91 |
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92 | /**
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93 | * Disables automatic `emitDestroy` when the object is garbage collected.
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94 | * This usually does not need to be set (even if `emitDestroy` is called
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95 | * manually), unless the resource's `asyncId` is retrieved and the
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96 | * sensitive API's `emitDestroy` is called with it.
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97 | * Default: `false`
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98 | */
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99 | requireManualDestroy?: boolean;
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100 | }
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101 |
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102 | /**
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103 | * The class AsyncResource was designed to be extended by the embedder's async resources.
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104 | * Using this users can easily trigger the lifetime events of their own resources.
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105 | */
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106 | class AsyncResource {
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107 | /**
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108 | * AsyncResource() is meant to be extended. Instantiating a
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109 | * new AsyncResource() also triggers init. If triggerAsyncId is omitted then
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110 | * async_hook.executionAsyncId() is used.
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111 | * @param type The type of async event.
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112 | * @param triggerAsyncId The ID of the execution context that created
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113 | * this async event (default: `executionAsyncId()`), or an
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114 | * AsyncResourceOptions object (since 9.3)
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115 | */
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116 | constructor(type: string, triggerAsyncId?: number|AsyncResourceOptions);
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117 |
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118 | /**
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119 | * Call the provided function with the provided arguments in the
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120 | * execution context of the async resource. This will establish the
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121 | * context, trigger the AsyncHooks before callbacks, call the function,
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122 | * trigger the AsyncHooks after callbacks, and then restore the original
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123 | * execution context.
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124 | * @param fn The function to call in the execution context of this
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125 | * async resource.
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126 | * @param thisArg The receiver to be used for the function call.
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127 | * @param args Optional arguments to pass to the function.
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128 | */
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129 | runInAsyncScope<This, Result>(fn: (this: This, ...args: any[]) => Result, thisArg?: This, ...args: any[]): Result;
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130 |
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131 | /**
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132 | * Call AsyncHooks destroy callbacks.
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133 | */
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134 | emitDestroy(): void;
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135 |
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136 | /**
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137 | * @return the unique ID assigned to this AsyncResource instance.
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138 | */
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139 | asyncId(): number;
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140 |
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141 | /**
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142 | * @return the trigger ID for this AsyncResource instance.
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143 | */
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144 | triggerAsyncId(): number;
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145 | }
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146 | }
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