BUILD

load("@bazel_skylib//rules:write_file.bzl", "write_file")
load("@bazel_skylib//rules:diff_test.bzl", "diff_test")

# Trivial test fixture: a nodejs program that writes to a file
write_file(
    name = "js",
    out = "some.js",
    content = ["require('fs').writeFileSync(process.argv[2], process.version + '\\n')"],
)

write_file(
    name = "write_expected",
    out = "expected",
    content = ["v16.12.0", ""],
)

genrule(
    name = "use_my_node_toolchain",
    srcs = ["some.js"],
    outs = ["actual1"],
    cmd = "$(NODE_PATH) $(execpath some.js) $@",
    toolchains = ["@testnode_toolchains//:resolved_toolchain"],
    tools = ["@testnode_toolchains//:resolved_toolchain"],
)

diff_test(
    name = "test_genrule",
    file1 = "expected",
    file2 = "actual1",
)

genrule(
    name = "use_default_node_toolchain",
    srcs = ["some.js"],
    outs = ["actual2"],
    cmd = "$(NODE_PATH) $(execpath some.js) $@",
    toolchains = ["@node_toolchains//:resolved_toolchain"],
    tools = ["@node_toolchains//:resolved_toolchain"],
)

write_file(
    name = "write_expected2",
    out = "expected2",
    content = ["v16.13.0", ""],
)

diff_test(
    name = "test_genrule2",
    file1 = "expected2",
    file2 = "actual2",
)

MODULE.bazel

""
module(
    name = "test",
    version = "0.0.0",
    toolchains_to_register = [
        "@node_toolchains//:all",
        "@testnode_toolchains//:all",
    ],
)
bazel_dep(name = "bazel_skylib", version = "1.0.3")
bazel_dep(name = "rules_nodejs", version = "4.4.6")

node = use_extension("@rules_nodejs//nodejs:extensions.bzl", "node")
node.toolchain(name = "testnode", node_version = "16.12.0")
use_repo(node, "testnode_toolchains")