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

NOTE: 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.