diff --git a/CHANGELOG.md b/CHANGELOG.md
index 8e11c331f..7b4c6a2a0 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -4,6 +4,7 @@ Full release notes with details on each version: [GitHub Releases](https://githu
 
 ## 0.9.42 (unreleased)
 
+- Fix: `.svelte` and `.astro` files now get a real AST pass. Both extractors fed the raw file to the JS grammar, which errors on the first tag (Svelte) or the opening `---` (Astro), abandoning the AST and leaving only the regex import rescue — so every function, const, interface and type in those files was invisible to the graph. Both now mask the non-code regions and parse the script with the TypeScript grammar, mirroring `extract_vue` (#850 family). Measured on a Svelte 5 + Astro monorepo: `.svelte` 931 → 4,307 nodes and 1,047 → 6,225 edges across 260 files; `.astro` 2,946 → 6,607 nodes and 9,963 → 15,337 edges across 1,107 files.
 - Fix: a JS/TS `for...of` / `for...in` loop binding is now shadowed, so passing it as a call argument no longer fabricates an `indirect_call` edge to an unrelated same-named callable (#2685, thanks @ousamabenyounes); completes the loop/closure/catch shadow family (#2568/#2569/#2517).
 - Fix: graph provenance (`built_at_commit`) is stamped from the analysed repository rather than the shell's working directory, so `graphify extract` run from elsewhere records the target's commit, not the caller's (#2534 family; #2699, thanks @C0KERNEL).
 - Fix: `affected` resolves a seed passed as a `./`-relative path (or an absolute path when run from the repo root) instead of silently returning nothing (#2707, thanks @phudayyy). Note: an absolute-path seed still requires the working directory to be the analysed repo root.
diff --git a/graphify/extract.py b/graphify/extract.py
index 6e1fca854..9dc36988a 100644
--- a/graphify/extract.py
+++ b/graphify/extract.py
@@ -134,6 +134,7 @@
     _ts_heritage_clause_entries,
     _ts_walk_class_members,
     _vue_mask_non_script,
+    _astro_best_mask,
     _walk_js_tree,
     _walk_python_tree,
     _workspace_globs,
@@ -1577,7 +1578,23 @@ def extract_svelte(path: Path) -> dict:
     {#await import('./X.svelte')} lives in the markup layer and is invisible
     to the JS parser, so a regex pass covers those dynamic imports.
     """
-    result = _extract_generic(path, _JS_CONFIG)
+    # Mask the markup so the <script> block reaches the AST
+    # pass. Without this the raw .svelte file makes the JS grammar error at the
+    # first tag, and only the regex rescue below contributes anything.
+    try:
+        _svelte_src = path.read_text(encoding="utf-8", errors="replace")
+        _masked, _svelte_lang = _vue_mask_non_script(_svelte_src)
+        if _svelte_lang == "tsx":
+            _svelte_config = _TSX_CONFIG
+        elif _svelte_lang in ("js", "jsx"):
+            _svelte_config = _JS_CONFIG
+        else:  # "ts" or unspecified — TS is a superset of JS, safe default
+            _svelte_config = _TS_CONFIG
+        result = _extract_generic(
+            path, _svelte_config, source_override=_masked.encode("utf-8")
+        )
+    except Exception:
+        result = _extract_generic(path, _JS_CONFIG)
     try:
         import re as _re
         src = path.read_text(encoding="utf-8", errors="replace")
@@ -1639,7 +1656,19 @@ def extract_astro(path: Path) -> dict:
     approach, scanning the frontmatter block and any client-side ``<script>`` blocks
     for static and dynamic imports.
     """
-    result = _extract_generic(path, _JS_CONFIG)
+    # Mask the template so frontmatter (and client scripts)
+    # reach the AST pass. Without this the raw .astro file makes the JS grammar
+    # error on the opening `---`, and only the regex rescue below contributes.
+    try:
+        result = _extract_generic(
+            path,
+            _TS_CONFIG,
+            source_override=_astro_best_mask(
+                path.read_text(encoding="utf-8", errors="replace")
+            ).encode("utf-8"),
+        )
+    except Exception:
+        result = _extract_generic(path, _JS_CONFIG)
     try:
         import re as _re
         src = path.read_text(encoding="utf-8", errors="replace")
diff --git a/graphify/extractors/resolution.py b/graphify/extractors/resolution.py
index aa57e351e..b8c9d2eb8 100644
--- a/graphify/extractors/resolution.py
+++ b/graphify/extractors/resolution.py
@@ -637,6 +637,66 @@ def _blank(s: str) -> str:
     out.append(_blank(src[pos:]))
     return "".join(out), lang
 
+
+# Astro frontmatter is a `---` fenced block that must open the file; a `---`
+# appearing later is markup, not code.
+_ASTRO_FRONTMATTER_RE = re.compile(r"\A(\s*---[^\n]*\r?\n)([\s\S]*?)(\r?\n---)")
+
+
+def _astro_mask(src: str, *, include_scripts: bool = True) -> str:
+    """Blank everything in a ``.astro`` file except executable TS/JS regions.
+
+    Astro files are ``---`` fenced TypeScript frontmatter followed by an
+    HTML-with-expressions template that may carry client-side ``<script>``
+    blocks. Neither the template nor the fences parse as JS, so feeding the raw
+    file to the JS grammar yields a top-level ERROR node and the AST pass is
+    abandoned (#850). Blanking the non-code regions — preserving ``\r``/``\n``
+    so line numbers stay accurate — lets the TS grammar see the real code.
+
+    ``include_scripts=False`` keeps only the frontmatter. Used as a fallback for
+    files whose client script does not concatenate cleanly onto the frontmatter.
+    """
+    def _blank_region(s: str) -> str:
+        return re.sub(r"[^\r\n]", " ", s)
+
+    m = _ASTRO_FRONTMATTER_RE.match(src)
+    if m:
+        out = [_blank_region(m.group(1)), m.group(2)]
+        pos = m.end(2)
+    else:
+        out, pos = [], 0
+    if include_scripts:
+        for sm in _VUE_SCRIPT_RE.finditer(src, pos):
+            out.append(_blank_region(src[pos:sm.start()]))
+            out.append(_blank_region(sm.group(1)))
+            out.append(sm.group(2))
+            out.append(_blank_region(sm.group(3)))
+            pos = sm.end()
+    out.append(_blank_region(src[pos:]))
+    return "".join(out)
+
+
+def _astro_best_mask(src: str) -> str:
+    """Mask an ``.astro`` file, preferring the variant that parses cleanly.
+
+    Frontmatter + client ``<script>`` yields the most symbols, but a client
+    script occasionally will not concatenate onto the frontmatter as valid TS.
+    Falling back to frontmatter-only recovers those without losing the rest.
+    """
+    with_scripts = _astro_mask(src, include_scripts=True)
+    try:
+        from tree_sitter import Language, Parser
+        import tree_sitter_typescript as _tsts
+        parser = Parser(Language(_tsts.language_typescript()))
+        if not parser.parse(with_scripts.encode("utf-8")).root_node.has_error:
+            return with_scripts
+        frontmatter_only = _astro_mask(src, include_scripts=False)
+        if not parser.parse(frontmatter_only.encode("utf-8")).root_node.has_error:
+            return frontmatter_only
+    except Exception:
+        pass
+    return with_scripts
+
 def _source_key(source_file: str, root: Path) -> str:
     if not source_file:
         return ""
@@ -1109,6 +1169,15 @@ def _parse_js_tree(path: Path):
                 path.read_text(encoding="utf-8", errors="replace")
             )
             source = masked.encode("utf-8")
+        elif path.suffix == ".svelte":
+            masked, vue_lang = _vue_mask_non_script(
+                path.read_text(encoding="utf-8", errors="replace")
+            )
+            source = masked.encode("utf-8")
+        elif path.suffix == ".astro":
+            source = _astro_best_mask(
+                path.read_text(encoding="utf-8", errors="replace")
+            ).encode("utf-8")
         else:
             source = path.read_bytes()
         use_ts = path.suffix in (".ts", ".mts", ".cts") or (
diff --git a/tests/test_svelte_astro_masking.py b/tests/test_svelte_astro_masking.py
new file mode 100644
index 000000000..365fc1d31
--- /dev/null
+++ b/tests/test_svelte_astro_masking.py
@@ -0,0 +1,158 @@
+"""Tests for ``.svelte`` and ``.astro`` script masking.
+
+Feeding a whole ``.svelte`` or ``.astro`` file to the JS grammar produces a
+top-level ERROR node, so the AST pass is abandoned and only the regex rescue
+contributes — imports survive, every declaration is lost.
+:func:`extract_svelte` and :func:`extract_astro` now mask the non-code regions
+and parse the real script with the TypeScript grammar, mirroring
+:func:`extract_vue`.
+"""
+from __future__ import annotations
+
+from pathlib import Path
+
+from graphify.detect import CODE_EXTENSIONS
+from graphify.extract import extract_astro, extract_svelte
+from graphify.extractors.resolution import _astro_mask, _vue_mask_non_script
+
+
+def _write(path: Path, body: str) -> Path:
+    path.parent.mkdir(parents=True, exist_ok=True)
+    path.write_text(body, encoding="utf-8")
+    return path
+
+
+def _labels(result: dict) -> set[str]:
+    return {str(n.get("label") or "") for n in result.get("nodes", [])}
+
+
+def _targets(result: dict, *, relation: str | None = None) -> set[str]:
+    return {
+        str(e.get("target") or "")
+        for e in result.get("edges", [])
+        if relation is None or e.get("relation") == relation
+    }
+
+
+SVELTE_SRC = """\
+<script lang="ts">
+  import { onMount } from 'svelte';
+  import Child from './Child.svelte';
+
+  interface Props { title: string }
+
+  const greeting = 'hello';
+
+  export function formatTitle(t: string): string {
+    return t.toUpperCase();
+  }
+
+  function handleClick() {
+    formatTitle(greeting);
+  }
+</script>
+
+<div on:click={handleClick}>
+  <Child />
+  {#if greeting}<span>{greeting}</span>{/if}
+</div>
+
+<style>
+  div { color: red; }
+</style>
+"""
+
+ASTRO_SRC = """\
+---
+import Layout from '../layouts/Layout.astro';
+import { getItems } from '../lib/items';
+
+interface PageProps { slug: string }
+
+const items = await getItems();
+
+function renderCount(n: number): string {
+  return `${n} items`;
+}
+---
+
+<Layout>
+  <p>{renderCount(items.length)}</p>
+</Layout>
+
+<script>
+  const clientOnly = 'browser';
+  console.log(clientOnly);
+</script>
+"""
+
+
+def test_extensions_registered():
+    assert ".svelte" in CODE_EXTENSIONS
+    assert ".astro" in CODE_EXTENSIONS
+
+
+def test_svelte_mask_preserves_line_numbers_and_blanks_markup():
+    masked, lang = _vue_mask_non_script(SVELTE_SRC)
+    assert lang == "ts"
+    assert len(masked.splitlines()) == len(SVELTE_SRC.splitlines())
+    # Script body survives; markup and style do not.
+    assert "formatTitle" in masked
+    assert "color: red" not in masked
+    assert "on:click" not in masked
+
+
+def test_astro_mask_preserves_line_numbers_and_blanks_template():
+    masked = _astro_mask(ASTRO_SRC)
+    assert len(masked.splitlines()) == len(ASTRO_SRC.splitlines())
+    assert "renderCount" in masked
+    assert "clientOnly" in masked  # client <script> kept
+    assert "<Layout>" not in masked
+
+
+def test_astro_mask_frontmatter_only_drops_client_script():
+    masked = _astro_mask(ASTRO_SRC, include_scripts=False)
+    assert "renderCount" in masked
+    assert "clientOnly" not in masked
+
+
+def test_astro_mask_without_frontmatter_is_safe():
+    src = "<h1>no frontmatter here</h1>\n"
+    masked = _astro_mask(src)
+    assert masked.strip() == ""
+    assert len(masked.splitlines()) == len(src.splitlines())
+
+
+def test_svelte_extraction_recovers_declarations(tmp_path: Path):
+    path = _write(tmp_path / "Widget.svelte", SVELTE_SRC)
+    result = extract_svelte(path)
+    assert not result.get("error")
+    labels = _labels(result)
+    # Declarations that the pre-masking extractor could never see. Function
+    # labels carry a "()" suffix; interfaces do not.
+    assert "formatTitle()" in labels
+    assert "handleClick()" in labels
+    assert "Props" in labels
+    # Imports still resolve, as before.
+    assert any("svelte" in t or "Child" in t for t in _targets(result))
+
+
+def test_astro_extraction_recovers_declarations(tmp_path: Path):
+    path = _write(tmp_path / "page.astro", ASTRO_SRC)
+    result = extract_astro(path)
+    assert not result.get("error")
+    labels = _labels(result)
+    assert "renderCount()" in labels
+    assert "PageProps" in labels
+    assert any("items" in t or "Layout" in t for t in _targets(result))
+
+
+def test_svelte_extraction_beats_unmasked_baseline(tmp_path: Path):
+    """The masked pass must strictly add nodes, never lose them."""
+    from graphify.extract import _JS_CONFIG
+    from graphify.extractors.engine import _extract_generic
+
+    path = _write(tmp_path / "Widget.svelte", SVELTE_SRC)
+    unmasked = _extract_generic(path, _JS_CONFIG)
+    masked = extract_svelte(path)
+    assert len(masked.get("nodes", [])) > len(unmasked.get("nodes", []))