Preset APIs in the Script

The script engine of Huawei Cloud Astro Zero uses the TypeScript language. During script execution, the TypeScript language is translated into the JavaScript language and executed by the JavaScript engine.

In addition to the official standard libraries of JavaScript ES5, Huawei Cloud Astro Zero provides more than 10 preset standard libraries (that is, preset APIs) to help you develop scripts more efficiently. Table 1 describes the standard libraries.

The following is an example of using a library:

import * as http from 'http';

**Table 1** Standard library description
Standard Library Name	Description
sys	Provides system-level operations, such as obtaining system parameter values and providing the alarm script library to set tracing points in scripts to report alarms.
context	Provides script execution context, for example, obtains the current tenant ID or current login user ID.
action	Defines the input and output methods of the script and the method of invoking the script.
buffer	Operates the binary buffer, for example, converts the content of the buffer to a string.
setup	Adds, deletes, modifies, and queries standard objects.
db	Adds, deletes, modifies, and queries the custom objects.
sql	Executes SQL statements. Currently, only "select" statements can be executed.
bo	Adds, deletes, modifies, and queries business objects.
meta	Operates object metadata, for example, obtains the field name or length.
http	HTTP or HTTPS operation.
iconv	Converts a string into the GBK, GB18030, GB2132, or ISO8859_1 encoding format, or decodes a string.
crypto	Performs encryption operation, including the encapsulation of hash, HMAC, encryption, decryption, signature, and verification.
decimal	Converts the value of the number type queried from the HTTP request or database to a decimal value and perform mathematical operations such as addition, subtraction, multiplication, and division.
excel	Operates an Excel file, for example, generates an Excel file.
text	Operates text, for example, converts text to binary.
xml	Operates XML files, for example, reading XML files.
uuid	Generates a globally unique ID.