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low-level-commands
Low Level Commands

esy provides a set of low level commands which enable more configurable workflows.

Such commands are grouped into two concerns:

  • Managing installations
  • Managing build environments

Managing installations

The following commands helps managing installations of dependencies.

The end product of an installation procedure is a solution lock (esy.lock directory) which describes the package graph which corresponds to the constraints defined in package.json manifest.

User typically don't need to run those commands but rather use esy install invocation or esy invocation which performs installation procedure as needed.

esy solve

esy solve command performs dependency resolution and produces the solution lock (esy.lock directory). It doesn't fetch package sources.

esy fetch

esy fetch command fetches package sources as defined in esy.lock making package sources available for the next commands in the pipeline.

Managing build environment

The following commands operate on a project which has the esy.lock produced and sources fetched.

esy build-dependencies

esy build-dependencies command builds dependencies in a given build environment for a given package:

esy build-dependencies [OPTION]... [PACKAGE]

Note that by default only regular packages are built, to build linked packages one need to pass --all command line flag.

Arguments:

  • PACKAGE (optional, default: root) Package to build dependencies for.

Options:

  • --all Build all dependencies (including linked packages)

  • --release Force to use "esy.build" commands (by default "esy.buildDev" commands are used)

    By default linked packages are built using "esy.buildDev" commands defined in their corresponding package.json manifests, passing --release makes build process use "esy.build" commands instead.

esy command-exec

esy-exec-command command executes a command in a given environment:

esy exec-command [OPTION]... PACKAGE COMMAND...

Arguments:

  • COMMAND (required) Command to execute within the environment.

  • PACKAGE (required) Package in which environment execute the command.

Options:

  • --build-context Initialize package's build context before executing the command.

    This provides the identical context as when running package build commands.

  • --envspec=DEPSPEC Define DEPSPEC expression which is used to construct the environment for the command invocation.

  • --include-build-env Include build environment.

  • --include-current-env Include current environment.

  • --include-npm-bin Include npm bin in $PATH.

esy print-env

esy-print-env command prints a configured environment on stdout:

esy print-env [OPTION]... PACKAGE

Arguments:

  • PACKAGE (required) Package in which environment execute the command.

Options:

  • --envspec=DEPSPEC Define DEPSPEC expression which is used to construct the environment for the command invocation.

  • --include-build-env Include build environment. This includes some special $cur__* envirironment variables, as well as environment variables configured in the esy.buildEnv section of the package config.

  • --include-current-env Include current environment.

  • --include-npm-bin Include npm bin in $PATH.

  • --json Format output as JSON

DEPSPEC

Some commands allow to define how an environment is constructed for each package based on other packages in a dependency graph (see --envspec command option described above). This is done via DEPSPEC expressions.

There are the following constructs available in DEPSPEC:

  • self refers to the current package, for which the environment is being constructed.

  • root refers to the root package in an esy project.

  • dependencies(PKG) refers to a set of "dependencies" of PKG package.

  • devDependencies(PKG) refers to a set of "devDependencies" of PKG package.

  • EXPR1 + EXPR2 refers to a set of packages found in EXPR1 or EXPR2 (union).

Examples:

  • Dependencies of the current package:

    dependencies(self)

    This constructs the environment which is analogous to the environment used to build packages.

  • Dev dependencies of the root package:

    devDependencies(root)
  • Dependencies of the current package and the package itself:

    dependencies(self) + self

    This constructs the environment which is analogous to the environment used in esy x CMD invocations.