docx-rs/docx-wasm/src/lib.rs

use docx_core;
use wasm_bindgen::prelude::*;

#[wasm_bindgen]
#[derive(Debug)]
pub struct Docx(docx_core::Docx);

#[wasm_bindgen(js_name = createDocx)]
pub fn create_docx() -> Docx {
    Docx(docx_core::Docx::new())
}

#[wasm_bindgen]
impl Docx {
    pub fn add_paragraph(mut self, p: Paragraph) -> Self {
        self.0 = self.0.add_paragraph(p.0);
        self
    }

    pub fn build(&mut self) -> Result<Vec<u8>, JsValue> {
        let buf = Vec::new();
        let mut cur = std::io::Cursor::new(buf);
        let res = self.0.build().pack(&mut cur);
        if res.is_err() {
            return Err(format!("{:?}", res).into());
        }
        Ok(cur.into_inner())
    }
}

#[wasm_bindgen]
#[derive(Debug)]
pub struct Paragraph(docx_core::Paragraph);

#[wasm_bindgen(js_name = createParagraph)]
pub fn create_paragraph() -> Paragraph {
    Paragraph(docx_core::Paragraph::new())
}

#[wasm_bindgen]
impl Paragraph {
    pub fn add_run(mut self, run: Run) -> Self {
        self.0 = self.0.add_run(run.0);
        self
    }
}

#[wasm_bindgen]
#[derive(Debug)]
pub struct Run(docx_core::Run);

#[wasm_bindgen(js_name = createRun)]
pub fn create_run() -> Run {
    Run(docx_core::Run::new())
}

#[wasm_bindgen]
impl Run {
    pub fn add_text(mut self, text: &str) -> Self {
        self.0 = self.0.add_text(text);
        self
    }
}