swc-project/swc · warning

No `.js` or `.jsx` files found in `{}`

Error message

No `.js` or `.jsx` files found in `{}`

What it means

The Flow strip verification subcommand collects candidate files under the given path via collect_flow_files (a directory walk that keeps .js/.jsx files) and refuses to run when the result set is empty. This is an input sanity check, not a crash: the command has nothing to verify. Only .js and .jsx extensions are considered, regardless of file contents.

Source

Thrown at crates/dbg-swc/src/es/flow/strip.rs:53

    #[clap(long)]
    pub enums: bool,

    #[clap(long)]
    pub decorators: bool,

    #[clap(long)]
    pub components: bool,

    #[clap(long)]
    pub pattern_matching: bool,
}

impl StripCommand {
    pub fn run(self, cm: Arc<SourceMap>) -> Result<()> {
        let files = collect_flow_files(&self.path)?;
        if files.is_empty() {
            bail!(
                "No `.js` or `.jsx` files found in `{}`",
                self.path.display()
            );
        }

        let flow_syntax = self.flow_syntax();
        let mut failures = Vec::new();

        for path in files.iter() {
            if let Err(err) = verify_file(cm.clone(), path, flow_syntax) {
                failures.push(err);
            }
        }

        let total = files.len();
        let failed = failures.len();
        let passed = total - failed;

View on GitHub (pinned to 5176682b65)

Solutions

1. Point the command at the directory that actually holds the Flow .js/.jsx sources
2. Verify the file set first: find <path> -name '*.js' -o -name '*.jsx'
3. Initialize submodules if the Flow corpus lives in one: git submodule update --init --recursive

Example fix

# before
$ dbg-swc es flow strip --path .   # repo root, only .ts files
error: No `.js` or `.jsx` files found in `.`

# after - target the Flow source tree
$ git submodule update --init --recursive
$ dbg-swc es flow strip --path ./submodules/flow/fixtures

#!/usr/bin/env bash
# verify the corpus has candidates before running the strip command
if ! find "$TARGET" -type f \( -name '*.js' -o -name '*.jsx' \) | grep -q .; then
  echo "no .js/.jsx files under $TARGET" >&2
  exit 2
fi
exec dbg-swc es flow strip --path "$TARGET"

When it happens

Trigger: Invoking the strip command with --path pointing at a tree that contains no .js/.jsx files: a .ts/.tsx-only project, an empty directory, or the wrong directory level (repo root when sources are in a subdirectory).

Common situations: Running against modern TypeScript repositories; forgetting 'git submodule update --init --recursive' so Flow fixture submodules are empty; passing a build output dir instead of the source dir.

Related errors

• path does not exist: `{}`
• flow strip verification failed
• flow types
• flow type cast
• flow

AI-assisted analysis of swc-project/swc@5176682b65 (2026-08-17). Data as JSON: /api/errors/07379d42f87fd046. Report an issue: GitHub.