Importing code

Tact allows you to import Tact and FunC code — any given .tact or .fc/.func file can be imported into your project using the import keyword.

Additionally, Tact compiler has a versatile set of standard libraries, which come bundled in, but not included right away, see Standard libraries overview.

Caution

All imported code is combined together with yours, so it’s important to avoid name collisions and always double-check the sources!

Import Tact code

It’s possible to import any Tact code using the import statement and providing a relative path to the target .tact file like so:

import "./relative/path/to/the/target/tact/file.tact";

Specifying parent directories (../) is also possible:

import "../subfolder/imported/file.tact";

Import FunC code

It’s possible to import code written in FunC code directly just as it’s done with Tact code imports:

// Relative import
import "./relative/path/to/the/target/func/file.fc";

// Specifying parent directories
import "../subfolder/imported/func/file.fc";

But in order to use functions from such file, one has to declare them as native functions first. For example, when standard library @stdlib/dns uses a dns.fc FunC file, it maps FunC functions to Tact ones like so:

// FunC code located in a file right next to the current Tact one:
import "./dns.fc";

// Mapping function signatures from FunC to Tact:
@name(dns_string_to_internal)
native dnsStringToInternal(str: String): Slice?;

Standard libraries

See Standard libraries overview.