The isolation application path is set to `{dir:?}` but it do

Error message

The isolation application path is set to `{dir:?}` but it does not exist

What it means

Compile-time panic in tauri-codegen when the Isolation pattern is enabled (feature 'isolation' + app > security > pattern use = 'isolation'). The configured isolation dir is joined onto the config's parent directory; if that path does not exist, generation aborts because Tauri must embed the isolation frontend as assets.

Source

Thrown at crates/tauri-codegen/src/context.rs:362

      tauri::embed_plist::embed_info_plist!(#plist);
    })
  } else {
    quote!()
  };
  #[cfg(not(target_os = "macos"))]
  let maybe_embed_plist_block = quote!();

  let pattern = match &options.pattern {
    PatternKind::Brownfield => quote!(#root::Pattern::Brownfield),
    #[cfg(not(feature = "isolation"))]
    PatternKind::Isolation { dir: _ } => {
      quote!(#root::Pattern::Brownfield)
    }
    #[cfg(feature = "isolation")]
    PatternKind::Isolation { dir } => {
      let dir = config_parent.join(dir);
      if !dir.exists() {
        panic!("The isolation application path is set to `{dir:?}` but it does not exist")
      }

      let mut sets_isolation_hook = false;

      let key = uuid::Uuid::new_v4().to_string();
      let map_isolation = map_isolation(&options, dir.clone());
      let assets = EmbeddedAssets::new(dir, &options, |key, path, input, csp_hashes| {
        // we check if `__TAURI_ISOLATION_HOOK__` exists in the isolation code
        // before modifying the files since we inject our own `__TAURI_ISOLATION_HOOK__` reference in HTML files
        if String::from_utf8_lossy(input).contains("__TAURI_ISOLATION_HOOK__") {
          sets_isolation_hook = true;
        }
        map_isolation(key, path, input, csp_hashes)
      })?;

      if !sets_isolation_hook {
        panic!("The isolation application does not contain a file setting the `window.__TAURI_ISOLATION_HOOK__` value.");
      }

View on GitHub (pinned to 52e4b6e71d)

Solutions

Create the configured isolation directory with at least an index.html (and your isolation scripts)
Fix the `dir` path under app > security > pattern so it points at the existing folder relative to tauri.conf.json
If isolation is not actually wanted, remove the pattern config to fall back to Brownfield

Example fix

// before (tauri.conf.json)
"app": { "security": { "pattern": { "use": "isolation", "isolation": { "dir": "../isolate" } } } }
// 'isolate' folder missing -> panic

// after
mkdir -p ../isolate && printf '<!doctype html><html><body><script>window.__TAURI_ISOLATION_HOOK__ = (e) => {};</script></body></html>' > ../isolate/index.html

Defensive patterns

Strategy: validation

Validate before calling

#!/usr/bin/env bash
dir=$(jq -r '.app.security.pattern.isolation.dir // empty' src-tauri/tauri.conf.json)
[ -n "$dir" ] && [ -d "src-tauri/$dir" ] || { echo "isolation dir '$dir' missing"; exit 1; }

Prevention

Commit the isolation directory (even a minimal index.html) together with the pattern config
Add a CI step that checks the configured isolation dir exists
If you disable isolation temporarily, remove the pattern config so codegen takes the Brownfield path

When it happens

Trigger: Configuring the isolation pattern without having created the isolation frontend directory; a typo'd dir value; the directory existing in one checkout but not on CI (gitignored or not committed).

Common situations: Following the isolation guide but skipping the 'create the isolation app' step; moving/renaming the folder without updating config; fresh clones missing an untracked directory.

Related errors

AI-assisted analysis of tauri-apps/tauri@52e4b6e71d (2026-08-20). Data as JSON: /api/errors/68483f0a5b8fb4a9. Report an issue: GitHub.