diff --git a/javascript/change-notes/2021-04-15-typescript-template-literal-type-crash.md b/javascript/change-notes/2021-04-15-typescript-template-literal-type-crash.md
new file mode 100644
index 000000000000..e08dbd54dd69
--- /dev/null
+++ b/javascript/change-notes/2021-04-15-typescript-template-literal-type-crash.md
@@ -0,0 +1,3 @@
+lgtm,codescanning
+* Fixed a bug that could cause extraction to fail when extracting a TypeScript
+  code base containing a template literal type without substitutions.
diff --git a/javascript/extractor/src/com/semmle/ts/extractor/TypeScriptASTConverter.java b/javascript/extractor/src/com/semmle/ts/extractor/TypeScriptASTConverter.java
index 36d4f8886187..f8ad99915c90 100644
--- a/javascript/extractor/src/com/semmle/ts/extractor/TypeScriptASTConverter.java
+++ b/javascript/extractor/src/com/semmle/ts/extractor/TypeScriptASTConverter.java
@@ -5,7 +5,6 @@
 import java.util.List;
 import java.util.regex.Matcher;
 import java.util.regex.Pattern;
-import java.util.stream.Collectors;
 
 import com.google.gson.JsonArray;
 import com.google.gson.JsonElement;
@@ -1001,10 +1000,10 @@ private Node convertConditionalExpression(JsonObject node, SourceLocation loc) t
   private Node convertConditionalType(JsonObject node, SourceLocation loc) throws ParseError {
     return new ConditionalTypeExpr(
         loc,
-        convertChild(node, "checkType"),
-        convertChild(node, "extendsType"),
-        convertChild(node, "trueType"),
-        convertChild(node, "falseType"));
+        convertChildAsType(node, "checkType"),
+        convertChildAsType(node, "extendsType"),
+        convertChildAsType(node, "trueType"),
+        convertChildAsType(node, "falseType"));
   }
 
   private SourceLocation getSourceRange(Position from, Position to) {
@@ -1613,6 +1612,10 @@ private Node convertLiteralType(JsonObject node, SourceLocation loc) throws Pars
         literal = new Literal(loc, arg.getTokenType(), "-" + arg.getValue());
       }
     }
+    if (literal instanceof TemplateLiteral) {
+      // A LiteralType containing a NoSubstitutionTemplateLiteral must produce a TemplateLiteralTypeExpr
+      return new TemplateLiteralTypeExpr(literal.getLoc(), new ArrayList<>(), ((TemplateLiteral)literal).getQuasis());
+    }
     return literal;
   }
 
@@ -1842,7 +1845,7 @@ private Node convertOmittedExpression() {
   }
 
   private Node convertOptionalType(JsonObject node, SourceLocation loc) throws ParseError {
-    return new OptionalTypeExpr(loc, convertChild(node, "type"));
+    return new OptionalTypeExpr(loc, convertChildAsType(node, "type"));
   }
 
   private ITypeExpression asType(Node node) {
diff --git a/javascript/extractor/tests/ts/output/trap/importNonStrings.ts.trap b/javascript/extractor/tests/ts/output/trap/importNonStrings.ts.trap
index c5fc95ddcb86..af044be98c89 100644
--- a/javascript/extractor/tests/ts/output/trap/importNonStrings.ts.trap
+++ b/javascript/extractor/tests/ts/output/trap/importNonStrings.ts.trap
@@ -9,34 +9,249 @@ hasLocation(#10000,#10002)
 #20000=@"global_scope"
 scopes(#20000,0)
 #20001=@"script;{#10000},1,1"
-toplevels(#20001,0)
-#20002=@"loc,{#10000},1,1,1,1"
-locations_default(#20002,#10000,1,1,1,1)
-hasLocation(#20001,#20002)
-#20003=*
-js_parse_errors(#20003,#20001,"Error: Unsupported syntax in import","type Y = import(`Foo`);
-")
-#20004=@"loc,{#10000},2,10,2,10"
-locations_default(#20004,#10000,2,10,2,10)
-hasLocation(#20003,#20004)
-#20005=*
-lines(#20005,#20001,"type X = import(3);","
+#20002=*
+lines(#20002,#20001,"type X = import(3);","
 ")
-#20006=@"loc,{#10000},1,1,1,19"
-locations_default(#20006,#10000,1,1,1,19)
-hasLocation(#20005,#20006)
-#20007=*
-lines(#20007,#20001,"type Y = import(`Foo`);","
+#20003=@"loc,{#10000},1,1,1,19"
+locations_default(#20003,#10000,1,1,1,19)
+hasLocation(#20002,#20003)
+#20004=*
+lines(#20004,#20001,"type Y = import(`Foo`);","
 ")
-#20008=@"loc,{#10000},2,1,2,23"
-locations_default(#20008,#10000,2,1,2,23)
-hasLocation(#20007,#20008)
-#20009=*
-lines(#20009,#20001,"type Z = import(Y);","
+#20005=@"loc,{#10000},2,1,2,23"
+locations_default(#20005,#10000,2,1,2,23)
+hasLocation(#20004,#20005)
+#20006=*
+lines(#20006,#20001,"type Z = import(Y);","
 ")
-#20010=@"loc,{#10000},3,1,3,19"
-locations_default(#20010,#10000,3,1,3,19)
-hasLocation(#20009,#20010)
-numlines(#20001,3,0,0)
-numlines(#10000,3,0,0)
+#20007=@"loc,{#10000},3,1,3,19"
+locations_default(#20007,#10000,3,1,3,19)
+hasLocation(#20006,#20007)
+numlines(#20001,3,3,0)
+#20008=*
+tokeninfo(#20008,7,#20001,0,"type")
+#20009=@"loc,{#10000},1,1,1,4"
+locations_default(#20009,#10000,1,1,1,4)
+hasLocation(#20008,#20009)
+#20010=*
+tokeninfo(#20010,6,#20001,1,"X")
+#20011=@"loc,{#10000},1,6,1,6"
+locations_default(#20011,#10000,1,6,1,6)
+hasLocation(#20010,#20011)
+#20012=*
+tokeninfo(#20012,8,#20001,2,"=")
+#20013=@"loc,{#10000},1,8,1,8"
+locations_default(#20013,#10000,1,8,1,8)
+hasLocation(#20012,#20013)
+#20014=*
+tokeninfo(#20014,7,#20001,3,"import")
+#20015=@"loc,{#10000},1,10,1,15"
+locations_default(#20015,#10000,1,10,1,15)
+hasLocation(#20014,#20015)
+#20016=*
+tokeninfo(#20016,8,#20001,4,"(")
+#20017=@"loc,{#10000},1,16,1,16"
+locations_default(#20017,#10000,1,16,1,16)
+hasLocation(#20016,#20017)
+#20018=*
+tokeninfo(#20018,3,#20001,5,"3")
+#20019=@"loc,{#10000},1,17,1,17"
+locations_default(#20019,#10000,1,17,1,17)
+hasLocation(#20018,#20019)
+#20020=*
+tokeninfo(#20020,8,#20001,6,")")
+#20021=@"loc,{#10000},1,18,1,18"
+locations_default(#20021,#10000,1,18,1,18)
+hasLocation(#20020,#20021)
+#20022=*
+tokeninfo(#20022,8,#20001,7,";")
+#20023=@"loc,{#10000},1,19,1,19"
+locations_default(#20023,#10000,1,19,1,19)
+hasLocation(#20022,#20023)
+#20024=*
+tokeninfo(#20024,7,#20001,8,"type")
+#20025=@"loc,{#10000},2,1,2,4"
+locations_default(#20025,#10000,2,1,2,4)
+hasLocation(#20024,#20025)
+#20026=*
+tokeninfo(#20026,6,#20001,9,"Y")
+#20027=@"loc,{#10000},2,6,2,6"
+locations_default(#20027,#10000,2,6,2,6)
+hasLocation(#20026,#20027)
+#20028=*
+tokeninfo(#20028,8,#20001,10,"=")
+#20029=@"loc,{#10000},2,8,2,8"
+locations_default(#20029,#10000,2,8,2,8)
+hasLocation(#20028,#20029)
+#20030=*
+tokeninfo(#20030,7,#20001,11,"import")
+#20031=@"loc,{#10000},2,10,2,15"
+locations_default(#20031,#10000,2,10,2,15)
+hasLocation(#20030,#20031)
+#20032=*
+tokeninfo(#20032,8,#20001,12,"(")
+#20033=@"loc,{#10000},2,16,2,16"
+locations_default(#20033,#10000,2,16,2,16)
+hasLocation(#20032,#20033)
+#20034=*
+tokeninfo(#20034,4,#20001,13,"`Foo`")
+#20035=@"loc,{#10000},2,17,2,21"
+locations_default(#20035,#10000,2,17,2,21)
+hasLocation(#20034,#20035)
+#20036=*
+tokeninfo(#20036,8,#20001,14,")")
+#20037=@"loc,{#10000},2,22,2,22"
+locations_default(#20037,#10000,2,22,2,22)
+hasLocation(#20036,#20037)
+#20038=*
+tokeninfo(#20038,8,#20001,15,";")
+#20039=@"loc,{#10000},2,23,2,23"
+locations_default(#20039,#10000,2,23,2,23)
+hasLocation(#20038,#20039)
+#20040=*
+tokeninfo(#20040,7,#20001,16,"type")
+#20041=@"loc,{#10000},3,1,3,4"
+locations_default(#20041,#10000,3,1,3,4)
+hasLocation(#20040,#20041)
+#20042=*
+tokeninfo(#20042,6,#20001,17,"Z")
+#20043=@"loc,{#10000},3,6,3,6"
+locations_default(#20043,#10000,3,6,3,6)
+hasLocation(#20042,#20043)
+#20044=*
+tokeninfo(#20044,8,#20001,18,"=")
+#20045=@"loc,{#10000},3,8,3,8"
+locations_default(#20045,#10000,3,8,3,8)
+hasLocation(#20044,#20045)
+#20046=*
+tokeninfo(#20046,7,#20001,19,"import")
+#20047=@"loc,{#10000},3,10,3,15"
+locations_default(#20047,#10000,3,10,3,15)
+hasLocation(#20046,#20047)
+#20048=*
+tokeninfo(#20048,8,#20001,20,"(")
+#20049=@"loc,{#10000},3,16,3,16"
+locations_default(#20049,#10000,3,16,3,16)
+hasLocation(#20048,#20049)
+#20050=*
+tokeninfo(#20050,6,#20001,21,"Y")
+#20051=@"loc,{#10000},3,17,3,17"
+locations_default(#20051,#10000,3,17,3,17)
+hasLocation(#20050,#20051)
+#20052=*
+tokeninfo(#20052,8,#20001,22,")")
+#20053=@"loc,{#10000},3,18,3,18"
+locations_default(#20053,#10000,3,18,3,18)
+hasLocation(#20052,#20053)
+#20054=*
+tokeninfo(#20054,8,#20001,23,";")
+#20055=@"loc,{#10000},3,19,3,19"
+locations_default(#20055,#10000,3,19,3,19)
+hasLocation(#20054,#20055)
+#20056=*
+tokeninfo(#20056,0,#20001,24,"")
+#20057=@"loc,{#10000},4,1,4,0"
+locations_default(#20057,#10000,4,1,4,0)
+hasLocation(#20056,#20057)
+toplevels(#20001,0)
+#20058=@"loc,{#10000},1,1,4,0"
+locations_default(#20058,#10000,1,1,4,0)
+hasLocation(#20001,#20058)
+#20059=@"local_type_name;{X};{#20000}"
+local_type_names(#20059,"X",#20000)
+#20060=@"local_type_name;{Y};{#20000}"
+local_type_names(#20060,"Y",#20000)
+#20061=@"local_type_name;{Z};{#20000}"
+local_type_names(#20061,"Z",#20000)
+#20062=*
+stmts(#20062,35,#20001,0,"type X = import(3);")
+hasLocation(#20062,#20003)
+stmt_containers(#20062,#20001)
+#20063=*
+typeexprs(#20063,1,#20062,0,"X")
+hasLocation(#20063,#20011)
+enclosing_stmt(#20063,#20062)
+expr_containers(#20063,#20001)
+literals("X","X",#20063)
+typedecl(#20063,#20059)
+#20064=*
+typeexprs(#20064,30,#20062,1,"import(3)")
+#20065=@"loc,{#10000},1,10,1,18"
+locations_default(#20065,#10000,1,10,1,18)
+hasLocation(#20064,#20065)
+enclosing_stmt(#20064,#20062)
+expr_containers(#20064,#20001)
+#20066=*
+typeexprs(#20066,4,#20064,0,"3")
+hasLocation(#20066,#20019)
+enclosing_stmt(#20066,#20062)
+expr_containers(#20066,#20001)
+literals("3","3",#20066)
+#20067=*
+stmts(#20067,35,#20001,1,"type Y  ... `Foo`);")
+hasLocation(#20067,#20005)
+stmt_containers(#20067,#20001)
+#20068=*
+typeexprs(#20068,1,#20067,0,"Y")
+hasLocation(#20068,#20027)
+enclosing_stmt(#20068,#20067)
+expr_containers(#20068,#20001)
+literals("Y","Y",#20068)
+typedecl(#20068,#20060)
+#20069=*
+typeexprs(#20069,30,#20067,1,"import(`Foo`)")
+#20070=@"loc,{#10000},2,10,2,22"
+locations_default(#20070,#10000,2,10,2,22)
+hasLocation(#20069,#20070)
+enclosing_stmt(#20069,#20067)
+expr_containers(#20069,#20001)
+#20071=*
+typeexprs(#20071,37,#20069,0,"`Foo`")
+hasLocation(#20071,#20035)
+enclosing_stmt(#20071,#20067)
+expr_containers(#20071,#20001)
+#20072=*
+typeexprs(#20072,3,#20071,0,"`Foo`")
+hasLocation(#20072,#20035)
+enclosing_stmt(#20072,#20067)
+expr_containers(#20072,#20001)
+literals("Foo","Foo",#20072)
+#20073=*
+stmts(#20073,35,#20001,2,"type Z = import(Y);")
+hasLocation(#20073,#20007)
+stmt_containers(#20073,#20001)
+#20074=*
+typeexprs(#20074,1,#20073,0,"Z")
+hasLocation(#20074,#20043)
+enclosing_stmt(#20074,#20073)
+expr_containers(#20074,#20001)
+literals("Z","Z",#20074)
+typedecl(#20074,#20061)
+#20075=*
+typeexprs(#20075,30,#20073,1,"import(Y)")
+#20076=@"loc,{#10000},3,10,3,18"
+locations_default(#20076,#10000,3,10,3,18)
+hasLocation(#20075,#20076)
+enclosing_stmt(#20075,#20073)
+expr_containers(#20075,#20001)
+#20077=*
+typeexprs(#20077,0,#20075,0,"Y")
+hasLocation(#20077,#20051)
+enclosing_stmt(#20077,#20073)
+expr_containers(#20077,#20001)
+literals("Y","Y",#20077)
+typebind(#20077,#20060)
+#20078=*
+entry_cfg_node(#20078,#20001)
+#20079=@"loc,{#10000},1,1,1,0"
+locations_default(#20079,#10000,1,1,1,0)
+hasLocation(#20078,#20079)
+#20080=*
+exit_cfg_node(#20080,#20001)
+hasLocation(#20080,#20057)
+successor(#20073,#20080)
+successor(#20067,#20073)
+successor(#20062,#20067)
+successor(#20078,#20062)
+numlines(#10000,3,3,0)
 filetype(#10000,"typescript")
diff --git a/javascript/ql/test/library-tests/TypeScript/RegressionTests/TemplateTypes/TemplateTypes.expected b/javascript/ql/test/library-tests/TypeScript/RegressionTests/TemplateTypes/TemplateTypes.expected
new file mode 100644
index 000000000000..e713b3e48049
--- /dev/null
+++ b/javascript/ql/test/library-tests/TypeScript/RegressionTests/TemplateTypes/TemplateTypes.expected
@@ -0,0 +1,6 @@
+| tst.ts:2:11:2:21 | `foo ${T1}` |
+| tst.ts:4:45:4:49 | `foo` |
+| tst.ts:4:53:4:57 | `bar` |
+| tst.ts:5:46:5:50 | `foo` |
+| tst.ts:5:54:5:63 | `bar ${K}` |
+| tst.ts:7:15:7:19 | `foo` |
diff --git a/javascript/ql/test/library-tests/TypeScript/RegressionTests/TemplateTypes/TemplateTypes.ql b/javascript/ql/test/library-tests/TypeScript/RegressionTests/TemplateTypes/TemplateTypes.ql
new file mode 100644
index 000000000000..f08f5a201dda
--- /dev/null
+++ b/javascript/ql/test/library-tests/TypeScript/RegressionTests/TemplateTypes/TemplateTypes.ql
@@ -0,0 +1,3 @@
+import javascript
+
+query TemplateLiteralTypeExpr literalType() { any() }
diff --git a/javascript/ql/test/library-tests/TypeScript/RegressionTests/TemplateTypes/tsconfig.json b/javascript/ql/test/library-tests/TypeScript/RegressionTests/TemplateTypes/tsconfig.json
new file mode 100644
index 000000000000..82194fc7ab06
--- /dev/null
+++ b/javascript/ql/test/library-tests/TypeScript/RegressionTests/TemplateTypes/tsconfig.json
@@ -0,0 +1,3 @@
+{
+    "include": ["."]
+}
diff --git a/javascript/ql/test/library-tests/TypeScript/RegressionTests/TemplateTypes/tst.ts b/javascript/ql/test/library-tests/TypeScript/RegressionTests/TemplateTypes/tst.ts
new file mode 100644
index 000000000000..21718ea3b340
--- /dev/null
+++ b/javascript/ql/test/library-tests/TypeScript/RegressionTests/TemplateTypes/tst.ts
@@ -0,0 +1,7 @@
+type T1 = 'foo' | 'bar';
+type T2 = `foo ${T1}`;
+
+type FooToBar<K extends string> = K extends `foo` ? `bar` : K;
+type FooToBar2<K extends string> = K extends `foo` ? `bar ${K}` : K;
+
+type Tuple = [`foo`?];